Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27675d6d9b6007c…

MALICIOUS

PDF

43.7 KB Created: 2020-08-24 15:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18a3782a0a61a428094340fdc0630da6 SHA-1: 562ca9528e7f29a268a2d04472287c0fd65e6499 SHA-256: d27675d6d9b6007c63e2b5ef33db0a864f9c4f4155d04633f3d773789ecdd2e7
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'Diabetes medicine guidelines'. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing attempts. The document body itself is heavily obfuscated but contains references to the malicious URL and a large number of other URLs, many hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=diabetes+medicine+guidelines
    • http://files.wellingtoncricketclub.com/uploads/1/3/0/9/130970004/3666886.pdf
    • http://files.busybfarm.com/uploads/1/3/1/4/131411762/fizabojuniwuzununegi.pdf
    • http://files.cassandradenhartog.com/uploads/1/3/1/0/131071072/vuzit.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/lemijenaguxuxetase.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/vukusevasuwel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5823/2473/files/ridgeway_grandfather_clock_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7037/1493/files/nexifuwatonaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0095/files/template_ppt_animasi_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6186/9733/files/voronezozogezivil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4996/files/93358039365.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/jujupenidirezabotapubu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/catoosa_county_property_tax_information.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/vefajisoxazinilajirex.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/10951277918.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/71017926165.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/nufikagobuwuvisegarofe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d62.bin
5a10eca9d1dd594426db2d086c508259190ebb7978d42262914990117179691e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D62 5304 bytes
font_01_sfnt_off00007f52.bin
60ffb9070f4a4eef66b38b05f0be375f6ae846221842b8dda97af1f4ff45e306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F52 10120 bytes

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