Malicious PDF — malware analysis report

Static analysis result for SHA-256 195c54d56b39de71…

MALICIOUS

PDF

58.7 KB Created: 2020-08-12 03:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d0354cde9308e5355fecbcda2df1a64 SHA-1: 392f8958926fb690e490929728b128331e7431be SHA-256: 195c54d56b39de710d6c936073ac211330a02a93e87cea017c84c46f28367d62
194 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate documents but lead to a known malicious redirector. The primary malicious link is https://ttraff.com/pify?keyword=bivariate+distribution+pdf, which likely serves as a gateway to further malicious content. The document's structure and the presence of numerous external links suggest a link farm or phishing attempt designed to drive traffic to 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=bivariate+distribution+pdf
    • http://files.alisonalbrecht.com/uploads/1/3/0/9/130969763/pufuxelivederoz-ruxuxizamewibi-pomigujado-ziwidisugexu.pdf
    • http://files.theinstituteofadvancedmedicalesthetics.com/uploads/1/3/0/7/130775232/5357271.pdf
    • http://files.themousethatroared.net/uploads/1/3/2/7/132740637/5536699.pdf
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/2015_ford_f_150_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4243/files/limawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/zidawiwirazud.pdf
    • https://cdn.shopify.com/s/files/1/0440/9124/4696/files/contracciones_isotonicas.pdf
    • https://cdn.shopify.com/s/files/1/0444/8436/2407/files/gakokozuzovisifetafeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/download_adobe_reader_untuk_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8927/2725/files/infarctus_du_myocarde_ecg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/l_articulation_du_genou.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/90858988523.pdf
    • https://cdn.shopify.com/s/files/1/0446/4377/8723/files/97583292277.pdf
    • https://cdn.shopify.com/s/files/1/0430/8035/1897/files/37416659128.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000863a.bin
bbbd8642e648ec270a3df88ab6f89942e450e00ffdd67595014455247f0ba9bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863A 5252 bytes
font_01_sfnt_off00009827.bin
addb6406d326384961320265708e11ce3f1275c9cba56c910bcac6a40e59e15d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9827 15068 bytes
font_02_sfnt_off0000c7ed.bin
759a82ebe72b6dc96189639c6fecbe257401e69c64d200a2cd462f3492d93e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 16268 bytes

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