Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2ccd8998110141…

MALICIOUS

PDF

50.4 KB Created: 2020-08-21 22:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a4fd8e79a9dacaf96898b3f3d1b0fe SHA-1: 73ab303c82346950f7d301f5eb465eeb33763f29 SHA-256: 0d2ccd899811014182163b0e28ee26bea9ebca30889d63e4f7f76217da2e37fd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that is part of a link farm, suggesting a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of malicious intent.

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=best+free+anti+malware+for+android
    • http://files.bluedolphinphuket.com/uploads/1/3/0/7/130739377/4afffe0da5.pdf
    • http://files.monsterinktattoostudio.com/uploads/1/3/0/7/130775396/867426.pdf
    • http://files.wisepennymarketing.com/uploads/1/3/1/6/131636612/6914354.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/dutobudewikajelalutamuzu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3732/5472/files/powerpyx_until_dawn_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/23425961699.pdf
    • https://cdn.shopify.com/s/files/1/0428/2685/8662/files/51824697901.pdf
    • https://cdn.shopify.com/s/files/1/0431/7252/8292/files/an_inspector_calls_essay_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wakorijupomimenupe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/vogikatoremavafaj.pdf
    • https://cdn.shopify.com/s/files/1/0448/2488/7456/files/commands_for_windows_command_prompt.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/ziwajusejapipamidebagas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007919.bin
306a485597dfbda0e50426113c7f9917caed455c93a6b99e49319e186b6d03ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7919 4984 bytes
font_01_sfnt_off000089f9.bin
2e40600c8061edfc95ef00a14d6cb7d1ba7d7556e16fb629dd4368047f578a43
pdf-font-stream PDF embedded font (sfnt) at offset 0x89F9 10860 bytes
font_02_sfnt_off0000ae51.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE51 4324 bytes