Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63813ef5273cf17…

MALICIOUS

PDF

38.1 KB Created: 2020-08-24 06:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96cb34cdb8c985bd69b12d33142c382 SHA-1: de53346db0be0a9f4a0829d6cfcf88c32082aa7b SHA-256: b63813ef5273cf17d773ce36f057a968833a2956df0c2c29867476b00743d977
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, identified as a redirector. The document body, though heavily obfuscated, contains text related to 'logo quiz answers' and the malicious URL itself, suggesting a lure to trick users into clicking the link. The presence of numerous embedded links, many pointing to Shopify domains, further supports the SEO link farm heuristic, indicating an attempt to manipulate search engine results or distribute malicious content.

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=logo+quiz+answers+level+6+logo+43
    • http://bolalanip.allwaysgaragedoors.com/uploads/1/3/2/6/132696414/xoserazak-fivaku.pdf
    • http://files.art-roca.com/uploads/1/3/0/7/130740357/2843085.pdf
    • http://files.hamiltoncountyfirechiefs.com/uploads/1/3/0/8/130873921/pupirobixitofuz.pdf
    • http://files.testsiteforhsct.info/uploads/1/3/1/6/131636845/rusitelagu_rekep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34597476450.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3580/files/lasomuvulijekabinet.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8124/files/system_of_inequalities_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/28577915687.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3399/files/nevanaxijevakifojulinufor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6605/files/astroneer_highly_compressed.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/skyrim_filled_black_soul_gem.pdf
    • https://cdn.shopify.com/s/files/1/0436/3000/2336/files/90668393693.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3695/files/dipiro.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_off000055a3.bin
bdca92948ababac0ce288e8da853dc29e1e73f84ad1575d78ba5b8e3d34863e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x55A3 5528 bytes
font_01_sfnt_off000068ab.bin
17d959aab46a1e02ca0bd0a2d9410b801cbed5e3bdf86419b98fe51d19af8576
pdf-font-stream PDF embedded font (sfnt) at offset 0x68AB 10316 bytes