Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbe84f5fc87ee34…

MALICIOUS

PDF

41.2 KB Created: 2020-09-02 07:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6617f8f3ae6b45f7fed6b3dd1110e2a1 SHA-1: 38f3111fcc8efa35e7295c3fa42c76b574b45e83 SHA-256: 0dbe84f5fc87ee349c9368f73d752371b50e5e5a42f0e03108da1c005a276d35
174 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. It also contains a large number of embedded links, many pointing to PDF files, flagged as a link farm. While no scripts were extracted, the presence of a malicious redirector and a link farm suggests an attempt to lead the user to malicious content or manipulate search engine results. The ML classifier also strongly indicated maliciousness.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.me/pify?keyword=authority+letter+format+for+labour+court
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f241d9_d3ebf2dc99f242109212bd604b790aef.pdf
    • https://static.usrfiles.com/ugd/7ff653_eb09b0e4f8ac4dc8b40fdfd25d5975fc.pdf
    • https://static.usrfiles.com/ugd/f0f215_10f040682e1c4ced9cc6acadbbfa7c2b.pdf
    • https://static.usrfiles.com/ugd/d32f78_b08252ea5c554c9585f46e08b3bb7c8b.pdf
    • https://static.usrfiles.com/ugd/73f3b0_c3d9303295084cf8b7fdee985ad36e50.pdf
    • https://static.usrfiles.com/ugd/0c41e7_1c31c1e5c79d4084a62357fb1d5de797.pdf
    • https://static.usrfiles.com/ugd/cc089a_4732abd02f9848f6a61baba9e1fb920c.pdf
    • https://static.usrfiles.com/ugd/f90bad_c9c659c35b9a4531a3c0f6f05900fdd6.pdf
    • https://static.usrfiles.com/ugd/2ca09c_edd6079943d44e04b749b83e237ee3b0.pdf
    • https://static.usrfiles.com/ugd/c0fca2_81a45e862bcf4dc38f070e4c72afdfd9.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/nidafutajodunemerisap.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/23707991888.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/fobotusobitonotujimabupag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/39882604610.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_off000061e0.bin
256a85cf069e3f7b78472758b132a2d396f4b8aedd9dba7105bb8090d309c2c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E0 5172 bytes
font_01_sfnt_off00007353.bin
6c42b650e6ddeec51d92c623873f2fa93ccd1d06e4f7e83e026ca3073377e7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7353 10696 bytes

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