Malicious PDF — malware analysis report

Static analysis result for SHA-256 d171c8aa0eaa8c15…

MALICIOUS

PDF

47.1 KB Created: 2020-08-17 12:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3611a584cde36bdadf7448faef529712 SHA-1: 772e3e961c78ce73beae65891b6b05323d45e375 SHA-256: d171c8aa0eaa8c154a2c594edac6c0cbfe41f14b4f2106ffa6c52286f81fd007
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with many pointing to a redirector service. This suggests a link farm or redirection attack designed to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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=angular+default+value+form
    • http://vopoxum.sistersofthecross.com/uploads/1/3/0/9/130969742/wuvoxuwasasox-fudimizefopami-winet-majudumapijoxa.pdf
    • http://files.amazingoxygen.com/uploads/1/3/1/4/131437236/naboveramifoxel-nadowukojolujag.pdf
    • http://files.bocahearts.com/uploads/1/3/0/8/130814594/6104853.pdf
    • http://files.noahsthompson.com/uploads/1/3/1/8/131856065/redesokuwabajo_wedisav_siwuxiv_refofibije.pdf
    • http://lunuzo.warfenburg.com/uploads/1/3/0/7/130739553/ebdddf8ce2c.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/tejitexon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/ramobasogexuwimupefidolot.pdf
    • https://cdn.shopify.com/s/files/1/0429/3492/7513/files/regud.pdf
    • https://cdn.shopify.com/s/files/1/0432/6273/8592/files/a_guide_to_mysql_pratt.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/89570154887.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/bp_oil_spill_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0439/9369/4366/files/72245387573.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/fubenulotuworexudijulidil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/79490203184.pdf
    • https://cdn.shopify.com/s/files/1/0433/5068/7903/files/kigusuvag.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_off00006b61.bin
8dcdea44a9809866f075b944571d9ccb449ed7228047eb0a15a7e1a02854f290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B61 5100 bytes
font_01_sfnt_off00007ca8.bin
9251a4906d8bab5926fc839347cbf1c9385ceaf48ce3586c5ac14627b25a7e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA8 15520 bytes

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