Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cc9de67de9702c…

MALICIOUS

PDF

45.1 KB Created: 2020-08-02 22:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e544721a5238c1ea0cae194985d6a95 SHA-1: fb6b75b2754b7c0ec0b45a6c3aab9fe6f2889e7c SHA-256: 51cc9de67de9702cb1479f555b987a5bf42095a6c69ef5e9758833572f04b16b
152 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector hosted on 'ttraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'elementary surveying 14th edition solutions pdf' and the malicious URL, suggesting a lure to trick users into downloading potentially harmful content. 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.ru/pify?keyword=elementary+surveying+14th+edition+solutions+pdf
    • http://files.urban-conservatory.com/uploads/1/3/0/9/130969960/5a16d.pdf
    • http://files.joannacookeart.com/uploads/1/3/1/4/131438718/3c68289a.pdf
    • http://files.royalfamilykidsneia.org/uploads/1/3/1/3/131398148/1323621.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/laxisezi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/solosukatubifitebir.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/49873823950.pdf
    • https://cdn.shopify.com/s/files/1/0427/5883/2294/files/94393511136.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/xibukivapivojezo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/21367642244.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/tozapotexodoxilobexuwaror.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0441/0173/0456/files/mewezaxobiwidaseto.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/49047074514.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89573664631.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1511/files/82772508243.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_off00007239.bin
9a648aaa8887d23eff865e8330b25dd26e1e412bb98112bf1cde7b1c930aeb43
pdf-font-stream PDF embedded font (sfnt) at offset 0x7239 5716 bytes
font_01_sfnt_off0000859f.bin
25fe504d1079788786a2b5cf128d98772368aa4b9ae9ccf558b564cd2334fca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x859F 9784 bytes