Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa88612e8c213107…

MALICIOUS

PDF

55.9 KB Created: 2020-07-20 22:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11b6b3814776c40433d77fedbc9f1878 SHA-1: fcc77309e03ac1fcf6e5825889775ee9a0b25062 SHA-256: fa88612e8c213107f62a2e6eac1f0a688abefe603fbaaeb1101157e87ba71eef
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.cc', are indicative of a redirection service likely used to obscure the final malicious destination. The presence of numerous links to external PDFs, many hosted on Shopify, suggests an attempt to create a link farm for SEO manipulation or to host a large number of lures.

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=jitsi+meet+android+studio
    • http://files.africanpromiseexp.com/uploads/1/3/1/1/131164204/mudip.pdf
    • http://files.shisko.com/uploads/1/3/0/8/130874489/xanuji_lejinusazaje_favilubaxu_rodejoza.pdf
    • http://files.fusion-chemical.com/uploads/1/3/0/7/130739126/0f459.pdf
    • http://files.dracutoymh.org/uploads/1/3/1/4/131453299/9567119.pdf
    • http://files.blugoldsunday.com/uploads/1/3/0/9/130969471/5727737.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/rovakani.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/mokasoxiluja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tomazemajetel.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8871/files/gituwusisumakilizar.pdf
    • https://segobagana.files.wordpress.com/2020/06/38765941235.pdf
    • https://rufijiku894783101.files.wordpress.com/2020/07/zofufedaliragolotikomijuz.pdf
    • https://xajetajopa.files.wordpress.com/2020/07/28295104250.pdf
    • https://dewotuf.files.wordpress.com/2020/07/42297769159.pdf
    • https://xajipajadiro.files.wordpress.com/2020/07/zopazijev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/28917708074.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/velarisezumolizisulija.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/tevejelasusufexifig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/9991648791.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/manavojapejovotudiput.pdf
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/xusixes.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_off000093f1.bin
182d7ef3ae94955a8a7101303d1ab0f77814db2a480f5268fb1be610ada92d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93F1 4812 bytes
font_01_sfnt_off0000a41f.bin
71a10a1e2dd83b13ce5726ca02eac44cba234acca541edfebd7c4bc4cd44446b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA41F 14376 bytes

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