Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d326c9d2c2d4b8…

MALICIOUS

PDF

58.9 KB Created: 2020-08-04 01:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccd81061cf145f37eeae3f886dcd0bfa SHA-1: 5725073e3e4b2fd37af06ca5733b9c7c96b539d4 SHA-256: 65d326c9d2c2d4b897b9094b8975446258181beffa60e08ad0f86ad27cb038b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body appears to be malformed or obfuscated, but the presence of the malicious URL and the link farm heuristic strongly suggest an attempt to lure users to malicious sites, likely for SEO poisoning or phishing purposes.

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=life+cycle+of+ascaris+lumbricoides+pdf
    • http://files.blessedaretheythatmourn.com/uploads/1/3/1/3/131379183/e57130c0a.pdf
    • http://files.pensacolacraftbeer.com/uploads/1/3/0/7/130775675/8518186.pdf
    • http://files.cuddlykoalaspreschool.org/uploads/1/3/0/7/130739517/1737f3bafab46.pdf
    • http://files.abbottspatchcollection.com/uploads/1/3/2/3/132303312/187834.pdf
    • http://files.jackandwinn.com/uploads/1/3/0/7/130738996/wemilerovapomiwukej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/lozabomox.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/15602559479.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/89452550406.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/lezodezolenuvudoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/8038/3653/files/81626753434.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/jafuzoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3681/files/zegidizoneturewu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/10104683224.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1541/files/vanilla_js_document_ready.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/moxovoviguvemijamupu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/pathfinder_advanced_race_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9782/files/11256169992.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2102/files/one_hundred_and_thirteenth_rule_of_acquisition.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9bc.bin
02834464b07ce3acf3be93c1fd81a8ba1ded218e86196e37b819b7b2c11e2d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BC 5484 bytes
font_01_sfnt_off0000bc57.bin
5873063a6c5b9a70cff26a5ac4b9364b770d591d55bc11dcaa04e0834fc2a23f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC57 9980 bytes

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