Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb392642c5297c0…

MALICIOUS

PDF

46.5 KB Created: 2020-08-16 02:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: febbc39781973e7469a885f23e72e110 SHA-1: cdf59617e9c18855ef98e9084529c742ffc07665 SHA-256: fcb392642c5297c098910ee7a1e3c6fa60a95ef7b1a32b5328ba39b34e9df1e4
194 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a download for 'sickle cell anemia pdf'. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm. The document body itself contains the malicious URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating lure documents.

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.com/wb?keyword=sickle%20cell%20anemia%20pdf%20download In PDF document text
    • http://files.graingercountytomatofestival.com/uploads/1/3/1/4/131452922/4702763.pdfIn PDF document text
    • http://files.artlessons4u.com/uploads/1/3/0/9/130969146/moxogopigazefaf.pdfIn PDF document text
    • http://vugerazi.objectivereader.com/uploads/1/3/1/6/131637240/xinajamakalomuk_mofeb_nalisa.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/1/0431/6450/0122/files/fewenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/minecraft_pe_skyblock_server.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2949/5959/files/wudugobizurexom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/dibanixivikakovizep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7541/1872/files/brisbane_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/lebejulewidegizuxuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/writing_sample_for_graduate_school_application.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0391/5933/files/bowuxamakiwazabobanexal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/recurrent_calcium_oxalate_stone_formation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1583/8618/files/sadidigajokotanuke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/93324823759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6757/8270/files/worksheet_arithmetic_and_geometric_sequences.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_off0000630b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630B 5284 bytes
SHA-256: 841813a996dd0a07cf165577e065b0bb4065df3bc9efc18dafbf8845718c257f
font_01_sfnt_off00007502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7502 10032 bytes
SHA-256: 4db46a7fc6b5a22c00cddd0a9e9d97d4e3f555e92541d527687c7bd491cb714d
font_02_sfnt_off0000979d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x979D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15