Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d42126ea061afe0…

MALICIOUS

PDF

36.2 KB Created: 2020-08-24 08:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52c2d2b368197955e133b9f97f2d1d54 SHA-1: 1d2c409f507977f779105faf44d580da18092a3c SHA-256: 6d42126ea061afe0c08c6519a8ed0ae60ad9126d8602cc728a52a7cf9a347fe3
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to generated SEO-style PDF URLs, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=rooh+bohemia+pardhan+song'. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to drive traffic to malicious sites, potentially for malware distribution or phishing.

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.cc/pify?keyword=rooh+bohemia+pardhan+song
    • http://files.stickemupracks.ca/uploads/1/3/0/8/130874063/9551589.pdf
    • http://bezakoxi.stephaniebrownscholarshipfoundation.com/uploads/1/3/1/1/131163776/4689000.pdf
    • http://fununapa.shoshonearts.com/uploads/1/3/2/8/132814097/6784817.pdf
    • http://biwutoz.wljaradio.net/uploads/1/3/0/9/130969503/juwet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/ruvekegemitipomigoduj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/bowumuroliputi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/bangla_book_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/nofomivoxizadozepusupawu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/lewaluzexoxoxoba.pdf
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/antiderivatives_and_indefinite_integrals_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/mexenijisefufejitosi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/razixadevige.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/56123531015.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/kupexuweragegevuboko.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/dabixuwovajujup.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_off0000427a.bin
99ed48f8b9e11bde75780ac8586a94684d38bfa5715d0eb2324c846bcf3e2ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x427A 3884 bytes
font_01_sfnt_off0000502c.bin
cb1fa0f715053e2b516e19fbfa7abbdcc6bb15beca3c2e3dfeda1402b618b1a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x502C 5488 bytes
font_02_sfnt_off000062a3.bin
3d52ebc9e6822d4fe7561c15087fb0b93049f9e8a3704e8c9eb767025ea763ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A3 9664 bytes

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