Malicious PDF — malware analysis report

Static analysis result for SHA-256 011afeec0c64d7c1…

MALICIOUS

PDF

41.8 KB Created: 2020-08-17 15:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cbdfee7d192660a64617077bad17fba SHA-1: f93d965b85e90fce8654cd051bf93b99cee4b67c SHA-256: 011afeec0c64d7c1bb2f6cec62d83d8a4cda6d67961f0812f04f41d980c7c26b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=mietb%25C3%25BCrgschaft+eltern+vorlage+pdf'. The document body, though heavily obfuscated, contains text suggesting it is a parental guarantee template, which is a common lure for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=mietb%25C3%25BCrgschaft+eltern+vorlage+pdf
    • http://giribi.blissnmotion.com/uploads/1/3/0/7/130738848/567fbb620327d.pdf
    • http://files.bcasbo.com/uploads/1/3/1/8/131856173/lujufu-wogufefejafuxew-wubarig-fofuwodulobiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/0426/9468/files/kutefebunef.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/fofibepimewubinaxar.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/wovaroweliv.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/allan_kardec_book_of_mediums.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/82071076861.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7075/files/nutritional_value_of_mushrooms.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/lominop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2819/files/masinekedimizakejexarilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/brahmanand_bhajan.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/5809764476.pdf
    • https://cdn.shopify.com/s/files/1/0440/5461/0070/files/basic_english_language_test.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_off00006089.bin
4e37674ba9efefe39db1734f670f0e3d16f4b2dd414b0e22bde7c37284a952fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6089 5740 bytes
font_01_sfnt_off000073e7.bin
1eab1df2f6d1e77c4144e9f676cbefb051909276e2f4db3ebf81efbfc553c244
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E7 11124 bytes