Malicious PDF — malware analysis report

Static analysis result for SHA-256 293f5aeba444c406…

MALICIOUS

PDF

44.7 KB Created: 2020-07-26 23:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62be943d31a9d5488bcbb061c27766c SHA-1: c9d62b30347fb57ba428383f4f7a9397d9264fb4 SHA-256: 293f5aeba444c406339af4bb894c2e397f50d4d774574419deb4efeaf2d585bc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for statistical resources. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a malicious link farm intended to redirect users to harmful sites.

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=basic+statistics+equation+sheet
    • http://files.donalcox.com/uploads/1/3/2/8/132814958/7917936.pdf
    • http://files.theolivebranchfrisco.org/uploads/1/3/1/1/131164275/4663717.pdf
    • http://files.lindasdesignersgroup.com/uploads/1/3/1/4/131407028/245a2db.pdf
    • http://files.morethansoulfood.net/uploads/1/3/2/3/132302973/timuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/42640543714.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2508/files/63051838294.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/rabetidoge.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/roroxebupajusikopuzij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/74298707273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1373/4563/files/51371571026.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/36500875397.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/wuzirawogikawonubode.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/tufog.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/94667012651.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xawifakupubegezixezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/xosexonuxewoxanatiwawojul.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_off00007383.bin
245bb45a6957c8345098caa54dcdfd34083312e5f28d17165dc316bf2dd6d0da
pdf-font-stream PDF embedded font (sfnt) at offset 0x7383 4816 bytes
font_01_sfnt_off000083d5.bin
f90e4e408ca04738d846c3bc6a364464f78229ae32b1ca05dc8122399b586cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x83D5 9792 bytes