Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7dc96d1fc3e916…

MALICIOUS

PDF

43.1 KB Created: 2020-08-07 04:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ace1c38eb0af68347b4c89c11cb692f3 SHA-1: a0d45d79ac7881926d45ec5219914f017896e40f SHA-256: 0c7dc96d1fc3e9167490c4e3702853c1b3ff8f08173589a49b14be06c0b817ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service (ttraff.com) which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a data analytics tutorial. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. No scripts were extracted from this sample.

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=data+analytics+python+tutorial+pdf
    • http://files.coopercatgallery.com/uploads/1/3/0/7/130739962/4754771.pdf
    • http://files.lynchburgkarate.com/uploads/1/3/0/7/130738639/modimizovevox.pdf
    • http://files.elderjacknielsen.com/uploads/1/3/0/7/130775098/wipiwiruk_fawoma_sonukofofal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4361/7959/files/70236266777.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/72172118301.pdf
    • https://cdn.shopify.com/s/files/1/0434/9807/8372/files/kifekewodixizeba.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/suxidomab.pdf
    • https://cdn.shopify.com/s/files/1/0438/0806/3649/files/no_in_other_languages.pdf
    • https://cdn.shopify.com/s/files/1/0434/8497/1173/files/6242244427.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/najovoxepipunufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0729/6163/files/setepirulo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/present_tense_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8921/files/83461710551.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/miravete_materiales_compuestos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/sogofumoboki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/libagurefoz.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_off00006923.bin
6eec94aec9b99697e368b23f31641e306731bc5f61d892d64e33aec4711e6b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6923 5344 bytes
font_01_sfnt_off00007b58.bin
68ed1890fedc7db9fa0d02f0d545503f6759e858af675d9e29404db7ff69f326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B58 10364 bytes

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