Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf949de5b3408ff9…

MALICIOUS

PDF

40.8 KB Created: 2020-08-24 23:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5cc588c60e1b770f9e4e0b56bf0932e SHA-1: e6b537d17a3cb002600620ee6b5c19274dece231 SHA-256: cf949de5b3408ff99b6052a94b2564d64293246529f70f2db9114b3f04b69f5b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a free software download. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs pointing to PDF files hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious 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.cc/pify?keyword=voxengo+drumformer+free
    • http://files.bigforkag.com/uploads/1/3/0/8/130814411/1ebf1badf2b15.pdf
    • http://files.beebetrained.com/uploads/1/3/1/4/131407944/84be5a3.pdf
    • http://mubon.kentuckyarttherapyassociation.org/uploads/1/3/1/6/131606490/bagape.pdf
    • http://files.stillyriveryarns.com/uploads/1/3/0/7/130738712/6066949.pdf
    • https://cdn.shopify.com/s/files/1/0448/6312/7714/files/grams_to_kilograms_conversion_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/1031/6694/files/zewolibewatovobevami.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/10662102273.pdf
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/94792398170.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0086/files/ripexasujesumivipefibele.pdf
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/jokotexorezal.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/gunafulixanuderet.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/50623347958.pdf
    • https://cdn.shopify.com/s/files/1/0445/3600/4767/files/rounding_and_estimating_worksheets_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0496/files/brown_forman_corp_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/ps4_emulator_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/25851542002.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/asymmetric_encryption_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/zonoxafulopa.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_off0000630e.bin
3471c5e0597050849b367583ddc36ca61ae3269afda19e31cd3a35b6f91e4faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630E 4840 bytes
font_01_sfnt_off0000737a.bin
4f07d206c625392283455f08ffabcfed3bf91271f647d4e5d101f04c16968dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737A 10144 bytes

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