Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfb82cffd7ba7d4…

MALICIOUS

PDF

59.3 KB Created: 2020-08-31 15:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d2cdfb02ed329aaee9011ef3020048 SHA-1: fec114dc388e41ad4a123dbcf654ff0aaf7a3e21 SHA-256: 0bfb82cffd7ba7d42158b59f4e2f366d6333969de7169237e7a5c97fab7ffff7
174 Risk Score

Malware Insights

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

The PDF document contains embedded links and text that mimic a 'Dish TV channel guide printable'. A critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=dish+tv+channel+guide+printable'. Another heuristic flagged the PDF for containing a mass external PDF link farm, suggesting SEO manipulation for malicious purposes. The ML classifier strongly indicated maliciousness, and the presence of callback phishing lures further supports a scam or phishing intent.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=dish+tv+channel+guide+printable
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7f16bd_b4346633e68441e9aeaf808cb2a34411.pdf
    • https://static.usrfiles.com/ugd/9edd50_229b66bc21de44e5bdab233b81d8ad39.pdf
    • https://static.usrfiles.com/ugd/f80014_099930541aef4710b02e884c197a30c2.pdf
    • https://static.usrfiles.com/ugd/4b874d_39a2b0b0e2784176a748683723c542aa.pdf
    • https://static.usrfiles.com/ugd/99afdc_cb1336e905514b36a3d4ad576c67ee01.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/nguyn_tuyt_mai_cng_ty_du_lch_vid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9912/files/15894111061.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/bitsat_previous_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/78586202529.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/talojoletapukojoboxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/general_aptitude_solving_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/kisobekor.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/koxewojurijugelu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1793/4747/files/mekidi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/14098432296.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/mozagukixene.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/21488518933.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6212/files/application_form_passport_post_office.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/1496208717.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0318/files/cisco_catalyst_9500_admin_guide.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_off000084dc.bin
20326e2b0fcf239b8950bfcff97cec3864979936dda696e08dbd07acf0a436ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DC 5532 bytes
font_01_sfnt_off000097ac.bin
20a304cf0d03dbfc53131e167eca8588def86ff8cc1e86bc946765d43628c0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AC 16180 bytes
font_02_sfnt_off0000c99f.bin
4d0700c2bed8ae31e296ea143d862b5f4c90f99d2dd4e3a41f3daee297692574		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 16348 bytes

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