Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b251009608565e3…

MALICIOUS

PDF

135.2 KB Created: 2020-08-28 02:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a956976b56201ef88a6d125821e33158 SHA-1: 03180fc2314dd4db03f5dbf13759ef4dfbca9acb SHA-256: 6b251009608565e3feb5c9a8b08d10b5946416744914d29dce4392685fe743d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains with numeric slugs, suggesting an attempt at SEO poisoning to drive traffic to malicious infrastructure. The primary malicious URL identified is a redirector, likely leading to further malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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.com/pify?keyword=trigonometric+identities+pdf
    • http://files.playwithfireproductions.com/uploads/1/3/2/7/132740327/9598114.pdf
    • http://tidavilu.shsoh.com/uploads/1/3/0/8/130814017/malevuba-filereze-jivubedaju-wisifirajuxeb.pdf
    • http://files.windsorjaguartroupe.com/uploads/1/3/0/7/130740524/pasogexotitizipaziz.pdf
    • http://files.lascolinaspta.org/uploads/1/3/1/8/131856602/lawizamafeguv_rematiw_pixubutojaw.pdf
    • http://soseniwe.lifetimeepoxyfloors.com/uploads/1/3/0/7/130776321/0fb88f3881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/18247822472.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/kexavelumejex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/android_home_environment_variable.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/86775164500.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/today_tamil_dinamani_news_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/29369326769.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/aadhar_card_online_password.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/sejarah_pendidikan_islam_di_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7321/files/30342207526.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/39239865049.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab90.bin
3e0b3b8c84b53eb3bea8d4118540c71750c2415bd448fe2431651f7ddb53b0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB90 5184 bytes
font_01_sfnt_off0001bd1d.bin
bc802c1ca003421a214e9e26fb1abbb4a47597cfd0ee357d003052a6274b5fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD1D 18092 bytes
font_02_sfnt_off0001f562.bin
c97c08f83b95756698725960492df3ecf4a68a00c08c4d43b6643dcbed77da32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F562 17440 bytes

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