Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb066d1686ce0cd…

MALICIOUS

PDF

40.5 KB Created: 2020-09-11 20:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73ab7493b172b3dbac617e13681e4357 SHA-1: 9ec33540e07a9f7a333969ee3dbe2f4a28efb177 SHA-256: 6fb066d1686ce0cd55ecc80831ed773f8756e6fa6c877812bd0d4abb43048007
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. One URL is specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of malicious links suggests an attempt to direct users to harmful content, possibly for SEO spam or phishing.

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.club/wix?keyword=empire+total+war+russian+campaign+guide
    • http://files.heartporthk.com/uploads/1/3/1/4/131454850/kufajiguxana.pdf
    • http://files.justbeau.studio/uploads/1/3/0/8/130874254/4103156.pdf
    • http://fiwupive.dorset-epc.co.uk/uploads/1/3/1/4/131453494/740c01a52db82e.pdf
    • http://gefulas.mommylife.us/uploads/1/3/0/8/130813528/legebugeti.pdf
    • http://files.mongomuscleapparel.com/uploads/1/3/0/8/130815093/9089901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/9696/9109/files/hammerdin_build_diablo_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/alkaline_and_acidic_food_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/albert_einstein_biography_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/bopuxuzojejeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7626/3841/files/fema_is_454_test_answers.pdf
    • https://static.usrfiles.com/ugd/bf650e_f00c311fdd924745ac37f1b76522aa44.pdf
    • https://static.usrfiles.com/ugd/9117e0_141047799562407b91b727e6ea82d683.pdf
    • https://static.usrfiles.com/ugd/e4d7df_6f370885a68a480ba848cfabd9246486.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb1e6880f2654da2884085ebdeb17af9.pdf
    • https://static.usrfiles.com/ugd/665c20_abbc59bf9acd4837881a1a1998ef0b3c.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f6c.bin
05e31cc73484bac07cac5548b2acb6a74aa46ecc3cf4e57a1f36394de25bc90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6C 5444 bytes
font_01_sfnt_off000071ea.bin
d4e92adcf1c68f85f8aa856964f30c1f48726a8cfe548cb70b564a159538b67d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EA 10288 bytes

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