Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b9bfff574753c4…

MALICIOUS

PDF

61.4 KB Created: 2020-08-08 10:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5cd0b0033ee90abe531c11481c9d564 SHA-1: 7ffef458b946176cecf93606bf1bd8b59f78ac1c SHA-256: 87b9bfff574753c4876f5a2684f728048a4d5dd14eff8c0f76d85cfb037afe17
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=du+ma+sociology+syllabus+pdf', suggesting a lure to a malicious site. The presence of a link farm indicates an attempt to manipulate search engine results to distribute 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.ru/pify?keyword=du+ma+sociology+syllabus+pdf
    • http://sizan.diaryofadogmom.com/uploads/1/3/0/7/130775934/2038423.pdf
    • http://kuwifup.wakeupandwritewrw.com/uploads/1/3/1/4/131407005/fodemugidavil.pdf
    • http://files.aeebeh.net/uploads/1/3/2/7/132740377/dodabosukog-kikovajalir-vitanudume-wusitemetuk.pdf
    • http://files.nppopb.com/uploads/1/3/1/4/131452942/piseruzatamigu.pdf
    • http://files.highschoolmathlive.com/uploads/1/3/2/8/132815737/ac0f7373fa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4551/files/fufixovebirodujodixoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/milin.pdf
    • https://cdn.shopify.com/s/files/1/0437/7732/7265/files/vetutifoxavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/45508285537.pdf
    • https://cdn.shopify.com/s/files/1/0437/0055/1830/files/renewable_energy_sources_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/49873164875.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7162/files/jagurodopigobomawakupuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/kifaf.pdf
    • https://cdn.shopify.com/s/files/1/0439/4686/8891/files/13118280399.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/xomiviwanagewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/74840179784.pdf
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/civ_5_spain_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/9332/7008/files/8838732375.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b85.bin
17d5ab988420d2b0f9e94e97764f4a4122acbd947db141c7ddc0f1c6d37af8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B85 5196 bytes
font_01_sfnt_off0000ad31.bin
87d0221b1c3e1ea74211be73dc1976df9acac2db38a0bd9bbc44624ef48fbd97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD31 14592 bytes
font_02_sfnt_off0000dab1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 4324 bytes

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