Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0acf1a7d2c0a6b9…

MALICIOUS

PDF

56.8 KB Created: 2020-07-31 06:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 79b1ad77c1c4f0edc43cacb6481ff7d6 SHA-1: 8a6d11007a32d6481dceea10d779dff0c93a94c8 SHA-256: c0acf1a7d2c0a6b9a885af97247328a847e645c9866255541b412b5763600c62
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically flagging a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a syllabus, suggesting a lure. The presence of numerous external PDF links further indicates an attempt to direct users to potentially harmful content.

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=upsc+botany+syllabus+2020+pdf In PDF document text
    • http://files.doodledogs.org/uploads/1/3/0/8/130814118/wanurete.pdfIn PDF document text
    • http://files.seafoammag.com/uploads/1/3/0/8/130813888/1376286.pdfIn PDF document text
    • http://files.singplayaudiate.com/uploads/1/3/2/6/132681144/f6d57c55.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/1/0439/5037/5070/files/piloda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3542/5944/files/15572458826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/dajavesugavasemof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/selavajumimoxogobanus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1592/0024/files/50897315668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/41578106670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/74014731881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3031/4151/files/jimolak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/30900096572.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3997/3788/files/rolodol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/72077029474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/dolovikawepobenegipatim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000818f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x818F 5276 bytes
SHA-256: 2d04f8196f71bea5b225e92c31c006c795241a4e57ae0fd32a14c95d73fc46fd
font_01_sfnt_off0000937e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x937E 2320 bytes
SHA-256: d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2
font_02_sfnt_off00009dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCF 9984 bytes
SHA-256: 2598ac2eecc6fee9c638ea1cf9f8ced6627bdf24069ad5b23c844aa33c756c06
font_03_sfnt_off0000bfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE3 16224 bytes
SHA-256: 207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265