Malicious PDF — malware analysis report

Static analysis result for SHA-256 755d8c1576e61752…

MALICIOUS

PDF

40.1 KB Created: 2020-08-26 04:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e4afb6bd6755f97b28272aa57a250bb SHA-1: 8303e2c5edc94cf10bd5e9b48a602b62818744a4 SHA-256: 755d8c1576e61752901de8b1cdeb6e97d738e6aa1d47a731b18f2bc7c6900546
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 12 external PDF links, one of which points to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of embedded URLs and the link farm structure suggests an attempt to redirect users to malicious content, likely as part of a phishing or scam campaign.

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=dac+19m009+rev+01a
    • http://files.kristyfarkas.net/uploads/1/3/0/7/130775627/5cc3877d8b7f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1058/0899/files/your_song_easy_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7715/files/12993413340.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8266/files/chemistry_book_class_11_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/43618358222.pdf
    • https://cdn.shopify.com/s/files/1/0432/4494/5571/files/10172516903.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/naropaxuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/1920089174.pdf
    • https://cdn.shopify.com/s/files/1/0434/4466/6529/files/algebra_1_chapter_3_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/8404/4705/files/45249191309.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/96567752407.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/2010_cadillac_cts_owners_manual.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_off00005e5d.bin
6014dc54285f3f3b14e58547fb0384fb0326df8dcdacfaf6f608f582c5b47f60
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5D 5144 bytes
font_01_sfnt_off00006fd8.bin
b5c8812d61965ee7f5292537b90c0869acf11253a243bab3ee1ee68c3de435a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD8 10576 bytes