Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b44e9c269ae995…

MALICIOUS

PDF

61.6 KB Created: 2020-08-19 06:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d4f9abf384b13aff2edc93e776c084c SHA-1: 391b8368d9c41a918336bb4719b89c96b2069bbb SHA-256: 68b44e9c269ae9955dd534da69026b23eba30abe5aca6e4e121c6ef32d728156
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector. The document body, though partially corrupted, contains text suggesting it is a "Gerrit code review installation guide" and includes a URL pointing to a malicious redirector. This indicates an attempt to trick users into visiting a malicious site, likely for phishing or malware distribution.

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.ru/pify?keyword=gerrit+code+review+installation+guide
    • http://files.bloomingtoncenterformindfulness.com/uploads/1/3/0/8/130874180/2578768.pdf
    • http://files.louisewknight.com/uploads/1/3/1/3/131384663/132813.pdf
    • http://rinajamof.newsunenergyworks.com/uploads/1/3/1/4/131406381/ruwuzosuverabi_rivigugutu_wewudiruka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9604/6752/files/16694338074.pdf
    • https://cdn.shopify.com/s/files/1/0432/7630/4544/files/nomeliramefamifejuwopoleg.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/xiziwisuledete.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3277/files/meal_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/problem_statement_canvas.pdf
    • https://cdn.shopify.com/s/files/1/0440/4704/0662/files/48653480168.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/watoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/degejuwetisagemudow.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5934/files/canton_ga_weather_radar.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/aoac_methods_of_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6428/7651/files/types_of_information_security_risk_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2442/files/emulator_android_ringan_untuk_linux.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_off0000a521.bin
9c0ae4d7223ab63feb464bfc39e2f63828121856d15779cba263954ad9455a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA521 5288 bytes
font_01_sfnt_off0000b74a.bin
429be330efc3b8848ffb98bf81233618f4c1ff94fc0d092159be3257b514090f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74A 16036 bytes

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