Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ca50ff4016ef72…

MALICIOUS

PDF

45.3 KB Created: 2020-08-24 11:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d136f18fa887e14d57f0cf875ed64360 SHA-1: 0aabdb385482e31fe461c316233676ef8574d55f SHA-256: 35ca50ff4016ef7288f84f3e1cf5a947fc90cf1b56ff0a2b937b0de3d4b24f99
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, ttraff.com, which then leads to a large collection of other PDFs hosted on Shopify. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=sample+of+application+letter+for+job+template
    • http://files.guitarsounds.com/uploads/1/3/2/3/132303359/6609263.pdf
    • http://kagalib.ohiodentallaboratory.com/uploads/1/3/1/6/131637136/4941754.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/77171983362.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/fimekemenituduwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/22097609423.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6646/files/applied_algebra_and_functional_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0438/5911/6182/files/mujubozedimuwamonumim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/loxevifajokusaxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/adblock_pro_chrome_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/rajulipepudekopuneluke.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5908/files/tesigumuvibil.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/rituridavijimisok.pdf
    • https://cdn.shopify.com/s/files/1/0448/4818/5501/files/25446174391.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/top_100_adjectives_in_english.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006671.bin
9b04fd8d3a81c3ced0b1d58230490918fd727c26c8a978b0e3652e660e6365cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6671 5088 bytes
font_01_sfnt_off00007791.bin
e9ae8ce7ea13e74717352bdc8d5ff74ee63f40e96f937b664e1af92de007e546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7791 9976 bytes
font_02_sfnt_off000099a2.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99A2 4324 bytes

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