Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d1cb8712179d41…

MALICIOUS

PDF

53.4 KB Created: 2020-08-25 18:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f4e9f68f23571ae2c528fcbcda5b10a SHA-1: 130ec7736f61d4420f5d7e05561ce3083b35663d SHA-256: 83d1cb8712179d410732ba3f6679a466ca88bd716c05a597ae69949764f1f69f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for downloading software. The document body also contains a similar URL, reinforcing the social engineering attempt. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm used to distribute malicious content or improve SEO for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=kmsauto+net+2018+v1.3.8+portable+download
    • http://files.mrgarcia.org/uploads/1/3/1/3/131380598/dogimiduzuwegesuta.pdf
    • http://furazaji.syxtrading.com/uploads/1/3/2/8/132814930/01ae7316d6.pdf
    • http://files.moniquemccrayjackson.com/uploads/1/3/2/6/132683014/zomuremuzoxivi_zajaved_jabok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/68816578399.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/fobesizap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/73184942401.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/seranisogetoke.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/pdf_antropologia_biblica.pdf
    • https://cdn.shopify.com/s/files/1/0464/5352/2600/files/ergothrapeute_formation_strasbourg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/bsc_maths_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/sananu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/rofibovonelumevawujowofe.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/93235391464.pdf
    • https://cdn.shopify.com/s/files/1/0433/8961/6279/files/95018735881.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/a_b_c_murders.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082ca.bin
a1820ea8ec1d0d26055ee1b7c25cd4118e65fe1d0834553f399a5e7a9adc5050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 5916 bytes
font_01_sfnt_off000096e4.bin
e4e739f525a4b9cfcc2928786abf6d680d438e214f80322bb05e5ec775abcd4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E4 10500 bytes
font_02_sfnt_off0000ba89.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA89 4324 bytes

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