Malicious PDF — malware analysis report

Static analysis result for SHA-256 5371e542bc111095…

MALICIOUS

PDF

44.7 KB Created: 2020-08-19 16:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a4ffc8582bb7314871f4b2162d6b38 SHA-1: 89119be05ab2f3afc8357c9a28ea55781dc1e740 SHA-256: 5371e542bc1110958b9623fb486d1a27e4974c8c335c6c4f3de5f8313d543dd8
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector (ttraff.ru). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure related to 'self guided tours of vietnam'. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, potentially to distribute further malicious content or improve search engine ranking for malicious 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=self+guided+tours+of+vietnam
    • http://totogevo.fromtheashesidaho.com/uploads/1/3/0/7/130775934/72fe95c90.pdf
    • http://bikolun.eddiejosemorales.com/uploads/1/3/0/7/130739963/bulexeroman-xujubux.pdf
    • http://fapid.kingdomcongress.com/uploads/1/3/0/7/130775934/6bd63772.pdf
    • http://files.ytcembroidery.com/uploads/1/3/2/6/132682681/1d1c2cf3f3.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/princeton_review_sat_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/96617390969.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/27791203456.pdf
    • https://cdn.shopify.com/s/files/1/0437/7028/2142/files/19339725135.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/buffalo_sabres_schedule_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/eminem_albums_download_zip.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/xotuzudiwopore.pdf
    • https://cdn.shopify.com/s/files/1/0430/6465/6026/files/online_gdb_compiler.pdf
    • https://cdn.shopify.com/s/files/1/0452/2855/6445/files/59887508272.pdf
    • https://cdn.shopify.com/s/files/1/0434/4755/0119/files/the_chronic_2001.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/rural_mailbox_guidelines_canada_post.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0961/files/income_tax_amendments_for_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/pinnacle_dazzle_drivers.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_off00006feb.bin
7f7e5335f9e4caa9315b40fc706f49c82371a15c17f4f77e42c836bc0f700333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEB 5388 bytes
font_01_sfnt_off0000822e.bin
220c5aafa35d7724f6c365a06f5dad73ce7d40fd32ce834ae62abfb9b5d3e41a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x822E 10364 bytes

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