Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4578ee82325d4c…

MALICIOUS

PDF

48.4 KB Created: 2020-08-22 01:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0bce4d536d7a523954cdeb03f97a506 SHA-1: d5604d098cd0f9878cd171a7e889a93b20e81533 SHA-256: 5a4578ee82325d4c3a1c23c4c2e855a91d8b4cb7e14f849ff7c35af1470c711b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users to download a form. The presence of numerous external PDF links, as flagged by PDF_SEO_LINK_FARM, further suggests a malicious intent to distribute harmful content. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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=ahcccs+apipa+prior+authorization+form
    • http://files.oakleytransport.com/uploads/1/3/2/8/132816185/333c4f.pdf
    • http://files.springscommunityacupuncture.com/uploads/1/3/0/7/130775503/3fe7b5c304d87.pdf
    • http://files.bthnm.org/uploads/1/3/0/7/130740213/dutoriwotiperubejiz.pdf
    • http://jexoreb.goplaysport.co/uploads/1/3/0/8/130814423/ccb4616.pdf
    • http://files.lgnillustration.com/uploads/1/3/1/8/131871687/romepituneseroguget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/piwopowuvadu.pdf
    • https://cdn.shopify.com/s/files/1/0451/7367/0037/files/cbse_sample_papers_for_class_10_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/51278702817.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/mivunopixapitunubowap.pdf
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/seether_truth_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/14924494986.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/33415648220.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/formal_letter_address_in_french.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3366/files/balaper.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007915.bin
6d082294e9836d42c7c53bf4e0c0147bce81b19ef73be686202062653cf25ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7915 5260 bytes
font_01_sfnt_off00008ad0.bin
2867ac0fec1a6a0932816aacaad482f826c23dba802163db738b3deea15efae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD0 13024 bytes