Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b99a3c4f546e0cc…

MALICIOUS

PDF

37.8 KB Created: 2020-07-23 20:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e7ef3297c9211e7e031669b2bc906b6 SHA-1: 33fb0f7e914d8079f3a79003eaa6e1f44aca93ab SHA-256: 2b99a3c4f546e0cc3c14fa31704052505a9df7e1720c6a460c4bb1bc467db704
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, identified as a link farm. One of the primary URLs, 'https://ttraff.ru/pify?keyword=bhakti+photo++wallpaper', is flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of numerous links to potentially compromised domains like shopify.com and other unknown file hosting sites suggests a coordinated effort to distribute malicious content or phish users.

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=bhakti+photo++wallpaper
    • http://files.protectionfenceco.com/uploads/1/3/1/8/131856234/tuboj-ziwatabom.pdf
    • http://files.homegrownhighways.com/uploads/1/3/2/8/132814826/dodoluwidinawuba.pdf
    • http://files.superiorusa.com/uploads/1/3/1/8/131872298/6414484.pdf
    • http://files.computerclubrhcc.com/uploads/1/3/1/6/131637131/joxumenafabele.pdf
    • http://files.superiorusa.com/upl
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/3887300740.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/96203662281.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/dikifidis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/tofotadunanosefizovaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutiga.pdf
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/94134246450.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/86983222432.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/gubedikerazuduxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/wimixetit.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/gunetabikebitax.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/rirudisasodazafivibupovat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/rumazugujodugibuweroxud.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/40178344140.pdf
    • https://cdn.shopify.com/s/files/1/0429/0278/2111/files/23976110488.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059ad.bin
e6b794354c631b1ad28f3f63c913b1fc13bceae73bc4125f4fb8ea67c77b94e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59AD 4616 bytes
font_01_sfnt_off0000697b.bin
604cdb7c20f621010d70ca7d8a1ebfd16766f5563b3fcb4100ba6586c50d9955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697B 9552 bytes

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