Malicious PDF — malware analysis report

Static analysis result for SHA-256 912c305ded769fff…

MALICIOUS

PDF

45.9 KB Created: 2020-07-28 03:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef680ba6356bb2f294e7a49160abb1ce SHA-1: d183e9a2e1101c583993c5f3e567dc08322f0e2e SHA-256: 912c305ded769fff9d95dfb39a2f65a496ee19f674abf5069f89879f5296ca10
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'foods to lower cholesterol'. The presence of many external PDF links, some pointing to potentially benign Shopify domains and others to unknown hosts, indicates a link farm strategy. The primary malicious IOC is the redirector URL, which likely serves as the initial stage for a phishing or scam campaign.

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.com/pify?keyword=foods+to+lower+cholesterol+pdf
    • http://files.hiddenhorseshoeacres.com/uploads/1/3/0/7/130775953/8359421.pdf
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • http://files.seanstrees.com/uploads/1/3/1/4/131482975/rumaf-kufigawusabeka-vuziro.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0429/2873/4375/files/57629888340.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasukeseduvemuledup.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/4577470560.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/43009493611.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/31564620058.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/defadove.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/68223208543.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/43655169744.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/90337661087.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7074/files/xojefifi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/garewikaponipeserejiwaruw.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/30405972306.pdf
    • https://medlineplus.gov/howtolowercholesterolwithdiet.html
    • 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_off000077cd.bin
a4ac1bc74c570fe48972f5db8ae9708aaa1d37f2e4dbadfbff1c420e2d41531b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 4712 bytes
font_01_sfnt_off00008806.bin
121fa6ad6f6072435b615afbc61c268fe287535913f952392d27c775da6026a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8806 10172 bytes

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