Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6ccadb728fedf2…

MALICIOUS

PDF

39.2 KB Created: 2020-08-05 07:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19931e518da8cd0f015fcd21d1b5e25c SHA-1: c844b1d04c2b541acff99f094926db7183b6738c SHA-256: 2c6ccadb728fedf23d3ede699058a751d2737432101d5f3220b13acd72846076
152 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.com, which is disguised as a free download for English moral stories. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm designed to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs confirms the redirection attempt.

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=english+moral+stories+pdf+free+download
    • http://files.mysticpointwatersports.com/uploads/1/3/0/7/130776401/lijebapamifupu-bifupibusej-kekexagererubiz.pdf
    • http://files.stlaurenceotoolesnsonline.com/uploads/1/3/1/4/131406751/2bbd840f01ce13.pdf
    • http://files.misskatrinasballerinas.com/uploads/1/3/1/6/131606256/sajuneduto.pdf
    • http://files.geriatricpsychiatryresearch.org/uploads/1/3/0/8/130814411/tojagivewilen.pdf
    • http://files.henrydai.net/uploads/1/3/1/0/131070487/sugixodila-buwot-tezixubonunu-lofovizodipebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/49417722036.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/dikevogavudobolimomofeve.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/5000_daily_used_words_in_english_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/cinex_hd_utility_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5481/files/rabujajitizibo.pdf
    • https://cdn.shopify.com/s/files/1/0443/4237/8652/files/coronary_artery_disease.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/64566702999.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/capek_rur.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/bopofimevaboxuratumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/51526497824.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_off00005acd.bin
7d0f44445f7c6060b0cb768114f66a522620c5cbd005b2bededcb7e82e1084c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACD 5504 bytes
font_01_sfnt_off00006d73.bin
0fbceb1ebf057311a8381c7984e0fb8260a0fb9e6886dcaa9e4f8452fcf48ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D73 10008 bytes

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