Malicious PDF — malware analysis report

Static analysis result for SHA-256 712b6aedf7139bab…

MALICIOUS

PDF

38.4 KB Created: 2020-08-24 04:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c145b7309578ec6dcaa689aca76b2cb SHA-1: 866c61e6ff7a0593a23f73840909d406ff65c662 SHA-256: 712b6aedf7139babae5fe6860f3d57d83767bc2484fbad838cbeb8ad86bc8d9c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=4th+grade+phases+of+the+moon+worksheet'. The document body, though partially corrupted, contains text suggesting it is a worksheet, which is likely a lure. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate a phishing or malware distribution attempt.

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=4th+grade+phases+of+the+moon+worksheet
    • http://files.veteranchildren.com/uploads/1/3/1/3/131380849/7830874.pdf
    • http://kaduzawa.l-mbodywork.com/uploads/1/3/0/7/130776449/3ee93.pdf
    • http://tunuragu.apextravelogue.com/uploads/1/3/2/8/132814956/0f32dbbbc.pdf
    • http://files.mrrestad.com/uploads/1/3/0/7/130738738/2990597.pdf
    • http://feviguj.soeasyofficial.com/uploads/1/3/2/6/132680813/7420293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8731/2536/files/noweroni.pdf
    • https://cdn.shopify.com/s/files/1/0433/7483/7918/files/79956640824.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/55963641440.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/23856962616.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/47867488673.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/lorexenezatasijo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/84994768094.pdf
    • https://cdn.shopify.com/s/files/1/0438/6055/7974/files/xelewezur.pdf
    • https://cdn.shopify.com/s/files/1/0460/0699/3057/files/xuxidisatagagefeluw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/75595220699.pdf
    • https://cdn.shopify.com/s/files/1/0450/1274/6390/files/arithmetical_reasoning_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/13359731590.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_off000056ac.bin
96109935393e166f07ba8031cd6c1e8890f06847586e5c691fcb417e5e144316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56AC 5572 bytes
font_01_sfnt_off000069a0.bin
30aaa0ef03833c7b3f6b53c6e7e5be5c8e4cb42c401a92d302e21fc5c6627f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A0 10240 bytes

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