Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a8b9dab5f894ba…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 10:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 630e5796bb1d6c52c4bcfa6a23bf3783 SHA-1: ba1b8b3cf7f7075af4835aacac22a57f68eb0c80 SHA-256: 14a8b9dab5f894ba6fd1a9773162abeb8866c37a78684f75fabb4489b884507a
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. The document body also contains multiple links to external PDFs, suggesting a link farm or content aggregation strategy. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution 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.com/wix?keyword=the+art+of+mackin+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/ce14f3_e7595895e55c441a940a53fa04276a1c.pdf
    • https://static.usrfiles.com/ugd/1b8612_5a416e1bea03470c8de7bd707935d35c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a427965a6c934825839395d22f6d7510.pdf
    • https://static.usrfiles.com/ugd/d63aaf_4c9c85c6e7e34238b2ab9f49c19e5569.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/55872067947.pdf
    • https://cdn.shopify.com/s/files/1/0429/0743/5167/files/bejegiviselisanazono.pdf
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/nabirosuwunepepakifinot.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/tevajajew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/daniliwijelojebirikedob.pdf
    • https://cdn.shopify.com/s/files/1/0440/2076/0741/files/online_adobe_reader_editor.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_770d8464c16c4f83aa4ce89011cdf860.pdf
    • https://static.usrfiles.com/ugd/0d089b_240cfb4eed0b40fe8d13c1215c779372.pdf
    • https://static.usrfiles.com/ugd/39cb9d_0cbc9c0c719a46e69cda480dc52d669c.pdf
    • https://static.usrfiles.com/ugd/565485_5abe24df42fd407ab178abf8b244f2b8.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_off00005a82.bin
b42c50024dd28e56ae86d6d37aa36f2b87706b7003be3fc736837f5322c27e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A82 4976 bytes
font_01_sfnt_off00006b54.bin
5a34e08d1965ea52b7eb2f765926f2a26a23c91d72e806a83d188a96c87b3fda
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B54 9812 bytes
font_02_sfnt_off00008ccc.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCC 4324 bytes