Malicious PDF — malware analysis report

Static analysis result for SHA-256 640f4aede34064d0…

MALICIOUS

PDF

43.0 KB Created: 2020-08-23 07:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b73dece6d5790d6485ff5022292d4ed1 SHA-1: 3b89770f0604c8f4b1b29a795871d39871445a07 SHA-256: 640f4aede34064d0bda4e98c9c14767ede165c2dfa21668b7282ea5a6b07ed57
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text suggesting a lure related to 'cyber bullying article pdf' and includes the malicious redirector URL. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external PDF links further supports a malicious intent, likely to lead users to harmful content or further stages of an attack.

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=cyber+bullying+article+pdf
    • http://files.rarebreednationllc.org/uploads/1/3/0/7/130738619/nagunogik_molosev_nakepadutoza_jajaludot.pdf
    • http://files.starwheelprinters.org/uploads/1/3/1/4/131453188/4b3f2b6480d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/0505/0784/files/cain_abel_password_sniffer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/craftsman_radial_arm_saw_recall.pdf
    • https://cdn.shopify.com/s/files/1/0438/6412/9696/files/suvukifilamofose.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/43795953386.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/pdf_book_marketing_management_philip_kotler.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/robawonoderonipezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25696514874.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/18885605494.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/81191097021.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_off00006c2d.bin
0f0236868cf426497388b9b0296f6efb2d16168a96a91e86c5712bb7364b1300
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2D 5292 bytes
font_01_sfnt_off00007e3e.bin
bb0347966fa8528aab701f4ad86771d51aaf4bb1dccef0a797837efeda693da2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3E 9900 bytes