Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e6a726299bdc41…

MALICIOUS

PDF

35.3 KB Created: 2020-08-19 20:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2d51dd8a66d79efebb94bacf0ba9fb2 SHA-1: 90caeca51ee5a92cd509bef92a47b54cf6a25bd9 SHA-256: 79e6a726299bdc41f738227683696554761bf80577d9d0d7c0d011ef1707790a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious due to its structure, which resembles an image-only lure designed to trick users into clicking a link. It contains a critical PDF_MALICIOUS_REDIRECTOR_LINK finding, pointing to `https://ttraff.cc/pify?keyword=cambium+force+180+user+guide`, which is known malicious infrastructure. The document also hosts a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. No scripts were extracted from this sample.

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 35 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=cambium+force+180+user+guide
    • http://files.studio-aegis.com/uploads/1/3/2/7/132740445/rafubedenozasi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/23144967716.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/58676806484.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/9269811045.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/watching_american_pie_2_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/72263890733.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/41899245651.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/the_year_of_magical_thinking.pdf
    • https://cdn.shopify.com/s/files/1/0432/6123/1262/files/jirinawigosizep.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/brain_games_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/viwuvilitoxufawopuwisom.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/10581093734.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_off000053b6.bin
3e40c8fa461d71a209f68b41d6a11aecefcaea93b08e2b0007ca24ad2ad27323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B6 5740 bytes
font_01_sfnt_off0000672c.bin
50dcc67693b81eb4e87d0ccdf9965fd988c69c52013ddec9504c824f969980b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672C 7564 bytes

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