Malicious PDF — malware analysis report

Static analysis result for SHA-256 f741890bbf3eab97…

MALICIOUS

PDF

65.1 KB Created: 2020-08-26 22:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3e523e4e89f87275be875d8b7b00f0 SHA-1: 6ae517a643a989ce56a2cea6bccbce91983911a9 SHA-256: f741890bbf3eab972638ca42eb8c969bd91ba54e6c311292408c2a242efe1c83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and a seemingly benign topic ('When is Beltane 2017') to mask the malicious intent. The presence of numerous other Shopify links suggests a link farm or SEO poisoning tactic to increase visibility.

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=when+is+beltane+2017
    • http://pufafu.maggiebandstra.com/uploads/1/3/1/3/131380755/xuvaj-sagejuteguguru-basexinenela-zijuji.pdf
    • http://files.capecodmedium.com/uploads/1/3/1/3/131379951/nagogopatatamu-zisadekobel.pdf
    • http://files.merkconstruction.com/uploads/1/3/0/7/130740571/4bfc19ea8d91f.pdf
    • http://kadodevi.adelantechc.org/uploads/1/3/2/6/132682878/siwiruba-lebuduj-bunibuzowiwo-vofuxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/suves.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0895/files/central_buttressing_bone_formation.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/zetesobokojoropenejunid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1219/3438/files/amblyopia_treatment_study.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/37040117292.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/wopajibekepudozafujiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0048/6312/files/kazivifexafexototilom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/bimikufev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0546/8068/files/ruwomipusefu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/toxekigagudobesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/47267851447.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/6550880162.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/parus.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_off0000bee1.bin
f9f54f0a236aff3f5ff44d995514de710387c0caae32621bf7e4cdc997291687		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 5236 bytes
font_01_sfnt_off0000d0bd.bin
faba129d84e8170226204356d55b0b8176de8f8a70b780d4da67633f91ed6eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 11420 bytes

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