Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c81f33892b9d45f…

MALICIOUS

PDF

53.7 KB Created: 2020-08-06 08:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17aafb3eee8fb974472d308207938600 SHA-1: 6323e54bc74bc2f99113e82af1256b21cfbf3f48 SHA-256: 3c81f33892b9d45fe8b931083f7c876ca0680f5a6776e4147adb247d74d4a898
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector to traff.ru, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=baby+names+girl+tamil+pdf, which is also listed as a malicious redirector. The presence of numerous PDF links, many pointing to Shopify domains, indicates an attempt to distribute content or potentially mask malicious activity through a large number of seemingly benign URLs. 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.ru/pify?keyword=baby+names+girl+tamil+pdf
    • http://files.hrpsychologyandcoaching.com/uploads/1/3/1/4/131453215/pusun-kewisuwuv.pdf
    • http://files.just-verandas.com/uploads/1/3/1/3/131379045/xobuxisedujus_wekabod.pdf
    • http://files.westside-church.com/uploads/1/3/0/8/130873846/1993171.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/marvelous_designer_6_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/98410446472.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/advanced_combat_tracker_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9818/files/certainty_equivalent_and_risk_premium_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/fototomewezawukixixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/timajutowewijowevevabin.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/98376734599.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/28374592694.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/8483226036.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6184/files/52844709440.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://blog.csdn.net/topmvp
    • 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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656d.bin
e6341219c5fd144ed224d0fc3ce15208a674107238868164600711714a508396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656D 13692 bytes
font_01_sfnt_off000091c0.bin
57053b1d9a1aba07a36ccaeafa8a7def9ee2afaec3b8c27aacf7574416c37e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C0 5652 bytes
font_02_sfnt_off0000a4e4.bin
afa9f3d8b2169f6b5a671250f4061487998eaf8a510bc1b0c6f661881552a52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E4 9920 bytes

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