Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c31c637f8b97f8…

MALICIOUS

PDF

29.6 KB Created: 2020-08-12 04:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 630bc0fd8c6764e7dedd350c0a04dc27 SHA-1: 07560aee199899446ebf73ba75adefd03f298d08 SHA-256: 75c31c637f8b97f82bbf13220a73f832768e52d36643edfa9b34edfa6bf9cf39
174 Risk Score

Malware Insights

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

The PDF is an image-only document designed as a lure, containing a clickable link that redirects to malicious infrastructure. The embedded URL `https://ttraff.cc/pify?keyword=calculus+textbook+pdf+larson` is identified as a malicious redirector. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, but the presence of a malicious redirector and the lure technique strongly indicate a phishing or scam attempt.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 29 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=calculus+textbook+pdf+larson
    • http://porikejos.bethanyclarephotography.com.au/uploads/1/3/1/3/131383791/2287837.pdf
    • http://files.izumipens.com/uploads/1/3/2/7/132740488/rigur-gokujib.pdf
    • http://files.bostonpreservationtrust.com/uploads/1/3/1/4/131483009/9617263.pdf
    • http://www.larsoncalculus.com
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/23458744652.pdf
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/78703414677.pdf
    • https://cdn.shopify.com/s/files/1/0434/2133/5702/files/zexuxadodufositepugide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/jobixemotovi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/nedineram.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2102/files/creative_writing_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/5059/7528/files/galletas_de_la_suerte.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/causas_del_abandono_escolar_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/59784923595.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/74295767783.pdf
    • https://www.nxtbook.com/nxtbooks/ngsp/financialalgebra_advanced2ndedi
    • 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_off00003c11.bin
4180d3b77e6e31151b40b6909f738324ec5137c3d52a870c2184b016e65ef17d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3C11 5328 bytes
font_01_sfnt_off00004e33.bin
92dcc8d7bd90af12de2fad38d05e7972e5d030facdb3256e0c4c8763bbc9f974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E33 8172 bytes

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