Malicious PDF — malware analysis report

Static analysis result for SHA-256 a925eae553c5ce7e…

MALICIOUS

PDF

42.2 KB Created: 2020-08-18 13:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0175f73a3f61d70012d8b7669c68f06 SHA-1: 51569efd4c1804f5b77c2ebb06550aa96ec6c343 SHA-256: a925eae553c5ce7ef83f5e4f6c6aa10b68a328b3278a49ce035d583e90eafac8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though partially corrupted, contains text related to 'best offline games for android under 500mb' and also includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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=best+offline+games+for+android+under+500mb
    • http://varisexoz.drtangiethesexdoctor.com/uploads/1/3/2/3/132303382/bufofumavo_fafumelitaru_garidoxorename_gurune.pdf
    • http://tifut.cmisafes.com/uploads/1/3/1/0/131070374/budukofudenafomeruv.pdf
    • http://wetutewi.healthylifecentreedinburgh.com/uploads/1/3/0/8/130874431/resixefaraluk_gixumu.pdf
    • https://cdn.shopify.com/s/files/1/0452/5775/2733/files/riwobinezubuxalanok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/kotajowaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/past_tense_affirmative_negative_interrogative_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/15204067791.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/noxon.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/anthracnose_disease_in_banana.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8128296882.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/18887913273.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9471/files/3433125628.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/66823291627.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/81318719972.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_off000065c1.bin
54f79c4618990b383ee8c6690c05476280b219d169abc48407d7cc5f33768b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x65C1 5680 bytes
font_01_sfnt_off000078f3.bin
7d50ec837d57fe41ca5c4c9080ea5b913d0c4ac47d73758319936572b64633ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F3 10348 bytes