Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b64cd4b01b335c…

MALICIOUS

PDF

49.2 KB Created: 2020-08-14 10:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900ce90f3ede68cfef2dec73bfd5bbfd SHA-1: ea58a8ea1c8f528a4a917820cd322754a96654b6 SHA-256: 66b64cd4b01b335c1b0fbd0f3f27d639ce926d6e8ecd793aec613f35cdec07bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector, indicating an attempt to distribute malware or phish users. The ML classifier also strongly flagged this PDF as malicious.

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=ept+reviewer+with+answer+key+for+teachers
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • http://papomupix.autobodyassociation.org/uploads/1/3/1/4/131483281/gasubodewuxiji-maziba.pdf
    • http://files.microlotmusic.com/uploads/1/3/1/6/131636827/4503004.pdf
    • http://files.njprint-wear.com/uploads/1/3/0/7/130739783/falafemamuw_vitupir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6760/4128/files/lixewinuxedijofidowanelot.pdf
    • https://cdn.shopify.com/s/files/1/0433/5265/3973/files/55464354622.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/90046176024.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/the_holy_bible_niv_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/35332496175.pdf
    • https://cdn.shopify.com/s/files/1/0437/5071/9642/files/24309205643.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/28153856040.pdf
    • https://cdn.shopify.com/s/files/1/0440/6208/1174/files/facetime_app_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/jogijuxasabake.pdf
    • https://cdn.shopify.com/s/files/1/0450/7618/5253/files/bsmrstu_admission_circular_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/zenanizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6002/files/10258699011.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_off0000821a.bin
f7f2a8220746ee8a741c4d98e15587e5870d0141559961f356b2b725ceb6789d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821A 5344 bytes
font_01_sfnt_off0000945d.bin
08334528659546d4f90d4b0b5d171effc351794c28ab8a6dac5801398317281e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x945D 10352 bytes

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