Malicious PDF — malware analysis report

Static analysis result for SHA-256 61484dc08e58f08e…

MALICIOUS

PDF

53.1 KB Created: 2020-08-06 20:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 288e7afb1faee63c3eba05b77a122bdc SHA-1: f82dabee18d5776963a5990720cda27d7bd7635d SHA-256: 61484dc08e58f08e10878674d0fcab3fa009301397d103c0d702a358fd892355
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious sites, specifically targeting searches for 'Apache spark python pdf'. The primary malicious URL identified is ttraff.com, which is flagged as a redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating link farms.

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=apache+spark+python+pdf
    • http://xisix.cosmorotica.com/uploads/1/3/1/3/131398591/xutib-nanegesuvut-vaginik.pdf
    • http://files.inolytix.com/uploads/1/3/0/7/130776204/6488704.pdf
    • http://files.americanfoursquare.us/uploads/1/3/2/7/132740218/majibomavapakabopi.pdf
    • http://files.janterradobe.com/uploads/1/3/1/3/131383892/2cc8bb59f1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/4369/1419/files/bojowariwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/xorenomilirovedikajomibej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/58985402774.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/54999285388.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/30023545192.pdf
    • https://cdn.shopify.com/s/files/1/0430/8513/6021/files/20265959246.pdf
    • https://cdn.shopify.com/s/files/1/0439/7488/5534/files/goloz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9958/5696/files/aceptacion_social_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/waravuvapokoberawedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/61702778678.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/vonafonivevefipixopilet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082bb.bin
d987645f58e7201c24318391578d949b81437501bf5174ae981a246bd7b143fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BB 5104 bytes
font_01_sfnt_off00009409.bin
307891e42b3e42caafcb0345758ae9dfaac4c1e42cb195ec23daea7c150729b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9409 10788 bytes
font_02_sfnt_off0000b907.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB907 4324 bytes

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