Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbdd788215d63fb…

MALICIOUS

PDF

45.4 KB Created: 2020-08-08 07:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddb2daa316144d76d2ec3eb91417942b SHA-1: 273944227fa34316df2e59985c76ed4b56dca17d SHA-256: 0dbdd788215d63fb7f476a4e4927b0f2f9eeadf7dc07c67720a9487b17fc66b4
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links, 'https://ttraff.cc/pify?keyword=basic+civil+engineering+questions+and+answers+pdf', is identified as a malicious redirector. The document body, though partially corrupted, contains this URL and references to civil engineering questions, indicating a lure to disguise the malicious redirection. No scripts were extracted, but the presence of a malicious redirector and the link farm strategy strongly suggest a phishing or scam attempt.

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.cc/pify?keyword=basic+civil+engineering+questions+and+answers+pdf
    • http://files.manhattangrace.org/uploads/1/3/0/8/130813841/fezoturegatez.pdf
    • http://files.wiltshire-epc.co.uk/uploads/1/3/1/4/131407705/disasuxuwogim-suzanivisej.pdf
    • http://files.spartanburgband.org/uploads/1/3/1/0/131070508/zijosamiwetematefu.pdf
    • http://files.brantfordtrackandfieldclub.com/uploads/1/3/1/3/131383478/9095082.pdf
    • http://jukiniwom.firstbaptistchurchleroy.org/uploads/1/3/0/7/130775934/ponibixixemuj_kunalatifu_juxaganofukirov_vosadeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2249/0532/files/probiotics_in_fermented_foods.pdf
    • https://cdn.shopify.com/s/files/1/0431/8262/0834/files/16508238525.pdf
    • https://cdn.shopify.com/s/files/1/0429/2883/2675/files/11631755696.pdf
    • https://cdn.shopify.com/s/files/1/0440/0952/1317/files/giginaweginojifo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3295/1446/files/6267219907.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/learning_generative_adversarial_networks_next_generation_deep_learning_simplified.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/50056080619.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/lefigonotuzakepajarete.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/vazezowowutefefajinuba.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3505/files/83859784337.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/powal.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_off00006bd0.bin
9df1018683dbf7a641ffcbcfc0cb577b653610f7343587c0147f143cc220a406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD0 5652 bytes
font_01_sfnt_off00007f29.bin
6508315ec93ccb38cf8358b1f7bebc966d5dece8e73c1ca62b6e47bac6a182fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F29 13020 bytes

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