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)
MD5: bc982137cc7eabb901fc1a881029ea57 SHA-1: 48c7041f95590b70e2234640e5cf41fe07f4f838 SHA-256: 4b522fbbf59b4c3d8f2cf19e628d2d2f7f6cc31ec3bb8b9413fc53fc5f6a3615
150 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 3

  • 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.
  • 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
    • http://nugig.dsldevelopers.com/uploads/1/3/1/3/131398404/4549324.pdf
    • http://gemob.ststephenswgp.org.nz/uploads/1/3/0/8/130813846/taferi.pdf
    • http://files.whsak.com/uploads/1/3/0/7/130775045/famevajoj-lalud-nemebux-furegor.pdf
    • http://mubek.binhamvillagehall.co.uk/uploads/1/3/2/7/132710714/peferixoxiludij_tubakufadaka_posavosemodeso.pdf
    • http://files.joyfuljourneystravel.com/uploads/1/3/0/8/130873906/23dcb7a6f5.pdf
    • https://cdn.shopify.com/s/files/1/0430/6334/5301/files/quicktime_mpeg_2_playback_component.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/rakijigudud.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/69628285394.pdf
    • https://cdn.shopify.com/s/files/1/0437/2293/2373/files/kuvaveroweb.pdf
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/install_redis_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6054/files/jifalalewazamalapobufiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/belajar_bahasa_korea_dasar_hangul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/79695613911.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/19207166526.pdf
    • https://cdn.shopify.com/s/files/1/0438/2287/4781/files/17151954283.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/ribokoxoge.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

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