Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b73684d516fdb6d…

MALICIOUS

PDF

34.0 KB Created: 2020-07-09 00:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0551dc4479974b0f865a3366b4729cdf SHA-1: 906acf2265d717de164cbcc7bae79b41161c8548 SHA-256: 7b73684d516fdb6d3173a4b7ad2867806fec2a4736319914549fa62205737315
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious due to its function as a link farm. It contains numerous SEO-optimized links, including one to a known malicious redirector, aiming to direct users to potentially harmful websites. The document body, while appearing to be a manual, is primarily a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=kenwood%20food%20processor%20multipro%20manual
    • http://files.gudrunhodge.com/uploads/1/3/1/3/131380032/nasubopijibabuduli.pdf
    • http://files.smc-gpaa.com/uploads/1/3/0/7/130739315/03daf866f0.pdf
    • http://files.agingobsession.com/uploads/1/3/1/8/131871648/jurotised_berereli.pdf
    • http://files.lakeshoremiddleschoolpto.org/uploads/1/3/1/4/131407281/9ea54a436.pdf
    • http://files.babyblueeyesragdolls.com/uploads/1/3/0/9/130969865/de17ff2.pdf
    • http://files.divorcecoachingandconsulting.com/uploads/1/3/0/8/130874518/bejam-soselovorifat-tekumubobup-powidonuvewadar.pdf
    • http://files.wccdesignbuild.com/uploads/1/3/1/4/131410545/wubofa.pdf
    • http://files.hordlevoluntarycare.org/uploads/1/3/0/8/130874413/zoladamalija.pdf
    • http://files.storiesbeyondgender.com/uploads/1/3/2/8/132815154/344039.pdf
    • http://files.thecherigroves.com/uploads/1/3/1/3/131398156/0c09cff1c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jekaxiwu.files.wordpress.com/2020/06/fojiburemazuretomeje.pdf
    • https://fofawogo.files.wordpress.com/2020/07/zabufikekom.pdf
    • https://pulanaradi.files.wordpress.com/2020/07/58241173867.pdf
    • https://xibelilunaf.files.wordpress.com/2020/07/11457629886.pdf
    • https://rifilaru.files.wordpress.com/2020/06/21253334775.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.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_off00004a96.bin
0573d9eafdf9075d3ea593b6c98115397e99d9e97e1ce95e1d6f3e71992ad1ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A96 5244 bytes
font_01_sfnt_off00005c68.bin
b2e47e6d8b513bc5bef63f0448a215ef1e36ea2fbd1daa6aca6d83171f160869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 8920 bytes

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