Malicious PDF — malware analysis report

Static analysis result for SHA-256 382da2a13c85dfd8…

MALICIOUS

PDF

51.6 KB Created: 2020-08-15 08:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 341a9506a588b192668003bbe29abb5b SHA-1: ae9cbed3386b890141774a76e948ca19c55488d2 SHA-256: 382da2a13c85dfd8d93b2c60058ed719fb6834ed9e51e6a324e70bb1a8cc861b
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=comprehension%20passages%20for%20class%205%20worksheets', which is likely the primary lure. The document body is heavily obfuscated but contains this same URL, reinforcing its role as the malicious payload delivery mechanism.

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.cc/wb?keyword=comprehension%20passages%20for%20class%205%20worksheets
    • http://gidoxovon.shopsimplync.com/uploads/1/3/2/3/132302780/pigaxuzerojuma.pdf
    • http://files.earlychildhoodeducationassembly.com/uploads/1/3/1/4/131437513/suzewopisudo-fufomojulufa-tanapumoxuge.pdf
    • http://nelig.beverlyjacobsart.com/uploads/1/3/1/6/131637830/vatodusuzav.pdf
    • http://files.seminlee.com/uploads/1/3/1/8/131856392/1125105.pdf
    • https://cdn.shopify.com/s/files/1/0434/1327/4780/files/vaxojixetisug.pdf
    • https://cdn.shopify.com/s/files/1/0436/4101/2382/files/sifutuwetutilam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/87561359366.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/85636265660.pdf
    • https://cdn.shopify.com/s/files/1/0429/0428/9439/files/muresesepeludibipazi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1167/files/nukimepuzalozirokasebinem.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/saxudopafajaxeluzixikifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/socioeconomic_status_and_academic_achievement.pdf
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/95502922751.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/63498447249.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/93491841.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/hypothenar_hammer_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/sebemepezizagid.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_off00007517.bin
f83c8136f86b59f95ca5b518db7343c91043f34167ae865e8a2c1bd003cfa956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7517 5616 bytes
font_01_sfnt_off00008823.bin
ae31a63ce5a49d942aa87298b747ff2bedfb8a9b2631d8f6cb1c1731a1043e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8823 10280 bytes
font_02_sfnt_off0000ab50.bin
a6405ff06d56862e28145c58ee6cc587d0d3bc8ed83d3fc02ef9be2f8f470b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB50 6168 bytes

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