Malicious PDF — malware analysis report

Static analysis result for SHA-256 737d1dad55e2c2b0…

MALICIOUS

PDF

43.3 KB Created: 2020-08-17 13:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f33f6cfbd7b7008a0afa6b320daf78ab SHA-1: 747620467f744772c5cd2f2c252ec148f62f8c0b SHA-256: 737d1dad55e2c2b0c8691e99b77cb055987ce6036745ecb670b4bb300d0a1b1a
174 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external links, indicating a link farm or redirection attempt. The document body, though partially corrupted, mentions 'nrf bursary application form' and includes the malicious URL, suggesting a phishing or scam lure. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=nrf+bursary+application+form
    • http://files.caledonjewels.com/uploads/1/3/1/3/131380258/593932.pdf
    • http://files.barefoottraveler.com/uploads/1/3/0/8/130814926/fagup_wigika.pdf
    • http://files.matchedbettingsite.com/uploads/1/3/1/4/131452988/zudikesobeb-faboxuja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3303/3880/files/37053888156.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/81590985146.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/discrete-_time_signal_processing_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/benzoilmetronidazol_40mg_ml_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/sumixesaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/2050/7544/files/business_intelligence_o_que.pdf
    • https://cdn.shopify.com/s/files/1/0435/9127/0563/files/b_com_syllabus_1st_year_2020_17.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/physics_walker_4th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/3508/1374/files/anaxagoras_philosophy.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/defalokatasegomifixiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0692/5720/files/brighthouse_tv_guide_app.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_off00006a78.bin
de97e54cb647ea2a21d09fb2f41caeb649da9b099762c036d78ef959cadca46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A78 5372 bytes
font_01_sfnt_off00007cab.bin
2dd2e18df14a15471f8beaf776cd9c27a71f93f6d9a7e2277a567de5a240a338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAB 10608 bytes

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