Malicious PDF — malware analysis report

Static analysis result for SHA-256 026d7328567a8eeb…

MALICIOUS

PDF

41.5 KB Created: 2020-08-15 08:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b77a95cc7c20eba5362e6d81554ae6ba SHA-1: aaebd28e03df6f8ce5b409f1069a190bfbc285d0 SHA-256: 026d7328567a8eebc3203abec47e39c0afa1d3a7dbf315b9fa797f1d9509aa29
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious URL identified is https://ttraff.ru/pify?keyword=fractions+to+decimals+tenths+hundredths+thousandths+worksheets, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a tactic to drive traffic to external sites under the guise of educational content.

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=fractions+to+decimals+tenths+hundredths+thousandths+worksheets
    • http://zoxaba.dutchhillfarm.shop/uploads/1/3/0/7/130740145/1468327.pdf
    • http://juxura.exquisitepropertieslawncare.com/uploads/1/3/0/8/130814229/9053130.pdf
    • http://files.denimxbonnie.com/uploads/1/3/1/6/131606314/ce86641861cc7.pdf
    • http://files.pvishnevetsky.com/uploads/1/3/1/3/131380848/posed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2307/9323/files/xolododagatemewoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/duzimijidi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/borneras_electricas.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/60341615446.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/2015_chevy_equinox_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3949/7112/files/zoxima.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/cable_gland_size_in_mm.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7938/files/galutefawexolip.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/12424596831.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/7443281486.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/xowoliterexidugaxosamaku.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_off000064d5.bin
5a665311dc33b501aa95268be784adfadcf618c2d3cf10029d04e303514f64d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D5 5292 bytes
font_01_sfnt_off000076ab.bin
f78f96cbf146f0f25b00a83e3cb9f9f0e7aeac2d43236ccc46cb21ddcb80664e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AB 9932 bytes

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