Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cbd23120896f0c…

MALICIOUS

PDF

131.4 KB Created: 2020-08-05 13:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 323ea31fa83d3caef79fb4622171a2c9 SHA-1: b9b8cd3d07563bf48c051dbada819ecd52295b25 SHA-256: 55cbd23120896f0c14ce6362c363760b5a12a11f8d7476ba3b7d0c7c6a250ce4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=amparito+roca+pdf+banda'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also contains a mass external PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0433/9977/4366/files/lowinalijutes.pdf'. The ML classifier strongly flagged this PDF as malicious.

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=amparito+roca+pdf+banda
    • http://files.paynefieldfarm.com/uploads/1/3/1/6/131607522/jidapi.pdf
    • http://files.robroymcfarland.com/uploads/1/3/2/6/132682882/tonomipa.pdf
    • http://ferikakij.danielsitaly.com/uploads/1/3/2/6/132695384/talif.pdf
    • http://files.literateinaminute.com/uploads/1/3/0/9/130969545/pamoguruvedu_pewowame.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4366/files/lowinalijutes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/2218157394.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1911/files/tapuriwejorawagasome.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/23223491674.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/pirerenikuluxonefexamul.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/29511196445.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7592/files/damilefanadevuvuvap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/acetilcolina_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/50743909139.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/78385144536.pdf
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/73356598401.pdf
    • https://cdn.shopify.com/s/files/1/0434/2913/4501/files/wosavaxamalute.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b69f.bin
cbe37d835bbbafcfd0e01dac609699d0a4ec5a416876d297309c547131ac1542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B69F 4888 bytes
font_01_sfnt_off0001c70b.bin
cc7f6126557adfe90a1686ada3ee2e664ce2c2cb7a1460eee9ba8916195c8803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C70B 13592 bytes
font_02_sfnt_off0001f295.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F295 4324 bytes

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