Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b522fbbf59b4c3d…

MALICIOUS

PDF

48.7 KB Created: 2020-08-13 01:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bc982137cc7eabb901fc1a881029ea57 SHA-1: 48c7041f95590b70e2234640e5cf41fe07f4f838 SHA-256: 4b522fbbf59b4c3d8f2cf19e628d2d2f7f6cc31ec3bb8b9413fc53fc5f6a3615
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, a common tactic for SEO spam and potentially malicious redirection. The primary malicious link identified is 'https://ttraff.cc/pify?keyword=learn+small+english+sentences+with+tamil+meaning+pdf+download', which is flagged as a known malicious redirector. The document body, though heavily corrupted, contains text related to PDF downloads and the authoring application, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=learn+small+english+sentences+with+tamil+meaning+pdf+download In PDF document text
    • http://nugig.dsldevelopers.com/uploads/1/3/1/3/131398404/4549324.pdfIn PDF document text
    • http://gemob.ststephenswgp.org.nz/uploads/1/3/0/8/130813846/taferi.pdfIn PDF document text
    • http://files.whsak.com/uploads/1/3/0/7/130775045/famevajoj-lalud-nemebux-furegor.pdfIn PDF document text
    • http://mubek.binhamvillagehall.co.uk/uploads/1/3/2/7/132710714/peferixoxiludij_tubakufadaka_posavosemodeso.pdfIn PDF document text
    • http://files.joyfuljourneystravel.com/uploads/1/3/0/8/130873906/23dcb7a6f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6334/5301/files/quicktime_mpeg_2_playback_component.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/rakijigudud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/69628285394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2293/2373/files/kuvaveroweb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/install_redis_ubuntu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5871/6054/files/jifalalewazamalapobufiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/belajar_bahasa_korea_dasar_hangul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/79695613911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/19207166526.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2287/4781/files/17151954283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/ribokoxoge.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A68 5604 bytes
SHA-256: 24b17141b10dfcf8d02272558f92d6b36c565c0636274d0a94fab1e2c6455647
font_01_sfnt_off00007d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D55 10024 bytes
SHA-256: aa6aaa2aeaf3fa9aab92ed61a7af80546995a65b4eb950e5c1272a0cb79770ba
font_02_sfnt_off00009fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCA 16424 bytes
SHA-256: ddb23a77d628db1a2b8e84d4fc11225cc01af4f0c5e6129a59955f60d25a4866