Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96f643c0eb2f4cc…

MALICIOUS

PDF

55.9 KB Created: 2020-08-04 10:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a110fd7675cd0614a020be2a4ee65743 SHA-1: 371bec393e3d9926543368d62995a62aa8924ba4 SHA-256: a96f643c0eb2f4cc8f543838c97905bcefb538d3e71ca862f6fcda22831d6402
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, including one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'curriculum vitae format' and the authoring application 'wkhtmltopdf', suggesting a lure for users seeking job-related documents. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector indicates an attempt to lead the user to a harmful destination, likely for phishing or malware delivery.

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=curriculum+vitae+format+in+sri+lanka+pdf In PDF document text
    • http://files.omnipilates.com/uploads/1/3/2/8/132816042/pazafovit_matime_mujamix_rufixosu.pdfIn PDF document text
    • http://files.coming-outofthedark.com/uploads/1/3/1/3/131381078/6281143.pdfIn PDF document text
    • http://bivovo.sandranyberg.com/uploads/1/3/0/7/130775934/pesinavejisepi-fuzaxev-nipuzufinaka-mesufis.pdfIn PDF document text
    • http://files.brucenwaller.com/uploads/1/3/0/8/130874240/4112316.pdfIn PDF document text
    • http://files.holdingspacedoula.com/uploads/1/3/0/8/130814611/15639a10ed6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/52509986726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/2643417847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/migeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/75045660433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/povamoduxukodemumazosov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/28168859619.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3230/5054/files/65937591533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/lepibanubakijude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/jiwesotusinowofutum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/69204601717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/99454658009.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/paxazisojuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/kifabuwipam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9F 5332 bytes
SHA-256: 0daf69c25713c507bd9c7734656d6c773bfa4697264a6b549ecc4c511fcf7423
font_01_sfnt_off00006d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6E 21496 bytes
SHA-256: b7be02d01bef9ff57b5fa2c7d1c630e075c0e911438028a9fe59a117021654ad
font_02_sfnt_off00009eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAB 10028 bytes
SHA-256: 38f13016bd3df2055891b81442061968e3af571d2bb70599e04557adf23648b6
font_03_sfnt_off0000c0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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