Malicious PDF — malware analysis report

Static analysis result for SHA-256 9383836d51298938…

MALICIOUS

PDF

47.4 KB Created: 2020-09-02 06:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228611bd264b5acb97090df5770d3f0b SHA-1: 4e852422138c7c00eba8dd87ef0e85d3ca342db8 SHA-256: 9383836d5129893838df5bd777a7e452f08463dab36863733c7d521f89a79526
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'free photoshop actions wedding' and includes the malicious URL, suggesting a lure to a scam or phishing site. The presence of numerous links to Shopify and other static hosting sites, as indicated by the PDF_SEO_LINK_FARM heuristic, points to a campaign distributing malicious PDFs. No scripts were extracted, limiting the analysis of direct payload execution.

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.me/wix?keyword=free++photoshop+actions+wedding
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/fupebugobefololax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/kavib.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/33530578136.pdf
    • https://cdn.shopify.com/s/files/1/0435/1292/2264/files/68181299052.pdf
    • https://cdn.shopify.com/s/files/1/0436/3842/3710/files/basics_of_technical_communication.pdf
    • https://static.usrfiles.com/ugd/c8a981_2857dd322db14aeb956494b0e9396ec9.pdf
    • https://static.usrfiles.com/ugd/2d1648_534c9bef66a7473a92487956e02bc513.pdf
    • https://static.usrfiles.com/ugd/c1615c_7a0d404c378b45eeb6ade850dda6c02e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b02aa0ade46f4f23bf2127895aa77f3b.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/high_school_admission_form_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7341/files/nevuxexuvabasegumipamifav.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9446/files/37730237718.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/63972919721.pdf
    • https://cdn.shopify.com/s/files/1/0440/5516/7126/files/listening_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/xezurotijoradodet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/gedijobadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1171/8820/files/3190191219.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/96726301060.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_off000074ad.bin
e59c3feb973919ca114842651709e0a16057453c87e78b9aff4a76a05e9e84be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AD 5348 bytes
font_01_sfnt_off000086eb.bin
a21c4ccc613cf06dd59135937702aafc75d8bc328ab937ccd3e4618ccc480956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86EB 12892 bytes

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