Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2493266f394da7…

MALICIOUS

PDF

43.1 KB Created: 2020-09-02 20:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e3b4537078889eccddd64388b3d6d9 SHA-1: 55f73632bbd19888f210452ea2e2c457322d63a6 SHA-256: af2493266f394da7cb289734837404f415d34b6f6c8dd2b55da37c02f65f8f19
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that, when clicked, redirects to a known malicious domain. The document body, though partially corrupted, includes text suggesting a lure related to 'Aptitude questions and answers pdf for gate' and the malicious URL itself. The PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics confirm the presence of malicious and link-farming behavior, respectively. 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/wix?keyword=aptitude+questions+and+answers+pdf+for+gate
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/57897848635.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/judokodemurukonove.pdf
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/brand_guidelines_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/google_docs_viewer_embed.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/xaxoxozoxojujizujupelol.pdf
    • https://static.usrfiles.com/ugd/a91264_69e6bbcddc904caeaeae39b86a6ed628.pdf
    • https://static.usrfiles.com/ugd/409ca8_15601ec6bb8748ff820a5ccd79abe304.pdf
    • https://static.usrfiles.com/ugd/e3325f_d65545f5cb2549d4bf3d7db07d19aa8c.pdf
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/suduwanefiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/sobawuzelir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/lukikabisenutaj.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8437bfbc26b424c91f8d9ba040621c6.pdf
    • https://static.usrfiles.com/ugd/6203b9_57a86f7ed8764f149503b2b0ed87c056.pdf
    • https://static.usrfiles.com/ugd/83d902_e888076ade654050ba5e18617c550694.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_off000068df.bin
bf7f3498796b9cb8c2df96530e05d3aa4025079fa1ac7d509aed0e810a94d458
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DF 5384 bytes
font_01_sfnt_off00007b4e.bin
ea09ca27424e11928230514ad7726eb749a4d9f059f33c2538524c0b4bf3e0c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4E 10996 bytes