Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff110c5e9d15629f…

MALICIOUS

PDF

43.8 KB Created: 2020-07-27 23:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d195a02051489b3887452d3e68622113 SHA-1: 2aaf07e3a490998f1026685e1c68593701a72c86 SHA-256: ff110c5e9d15629f2cb7b9b60a7836c0c7f3f0ccfd1bc213711836f650ba4030
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged for linking to known malicious redirector infrastructure and for containing a large number of external links, characteristic of a link farm. The embedded URL points to 'ttraff.ru', which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Florida annulment of marriage form', suggesting a lure for users seeking legal documents.

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=florida+annulment+of+marriage+form
    • http://files.alphachiomegaofoaklandcounty.org/uploads/1/3/1/4/131406688/molivoget.pdf
    • http://files.tonicher.co.uk/uploads/1/3/0/8/130813988/1ae394.pdf
    • http://files.geldmeierfenceanddeck.com/uploads/1/3/1/4/131482864/rowatudunuwufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3433/7695/files/vorogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0282/files/15748617972.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/61068189084.pdf
    • https://cdn.shopify.com/s/files/1/0440/4038/8758/files/biraxopumopirizesijov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/zipigikajonu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9797/files/setimegize.pdf
    • https://cdn.shopify.com/s/files/1/0438/9689/7704/files/82393156883.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/rewipejetufokejataxap.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/33134197870.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/11635794808.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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f7c.bin
c072434c992881f9fabb97ef9f0e26ed66be2ca0fe0c4b6a22f431c6d8cfbd18
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7C 4888 bytes
font_01_sfnt_off00007ffb.bin
76291396b42fd3463f910b4317b5c8532fed677d113901dc1b4d7e4df68add19
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFB 9948 bytes