Malicious PDF — malware analysis report

Static analysis result for SHA-256 49393f50079764f8…

MALICIOUS

PDF

36.4 KB Created: 2020-08-31 03:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0cf1d6b06a0c1bb5df462b9f411f561 SHA-1: f634738059dc6cdd514d0c9ee00acdcdaa8108b1 SHA-256: 49393f50079764f8555ccef1cb95448d153aca9ed823927c9e4b4565e9934953
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external PDF links, characteristic of a link farm. The primary malicious IOC is the redirector URL, which likely serves as the entry point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=getting+started+with+matlab+rudra+pratap
    • https://cdn.shopify.com/s/files/1/0435/5981/3279/files/5819496134.pdf
    • https://cdn.shopify.com/s/files/1/0435/5892/8545/files/contoh_media_audio_visual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/anthem_by_ayn_rand_download.pdf
    • https://cdn.shopify.com/s/files/1/0468/9677/5330/files/81781300257.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e04b37cf8234c69b4a55d7882f1f717.pdf
    • https://static.usrfiles.com/ugd/b98abb_b451de2fbcef4234aea51e130e49192c.pdf
    • https://static.usrfiles.com/ugd/191a6d_d2745e38ae4d4e4e946346061b7b1954.pdf
    • https://static.usrfiles.com/ugd/b8c837_1efa1e563b4d463590492b88544a8ace.pdf
    • https://static.usrfiles.com/ugd/b8c837_d01a7cd95c214d478b765003b0f36d62.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/pedotogunufezene.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/pegegunodelisufuwigudegu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9271/files/benton_sans_book_font.pdf
    • https://cdn.shopify.com/s/files/1/0448/1577/7954/files/a_level_physics_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24221046066.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/xemonifikesuzofebi.pdf
    • https://cdn.shopify.com/s/files/1/0444/8839/2871/files/pharmacy_personal_statement.pdf
    • https://cdn.shopify.com/s/files/1/0447/8743/3623/files/1398702561.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/bernoulli_differential_equation_solved_problems.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_off000050a5.bin
437f8625faca5827ef682c3a582bb23d8479d8ce5012abaacf03ae2bddabf273
pdf-font-stream PDF embedded font (sfnt) at offset 0x50A5 5636 bytes
font_01_sfnt_off000063af.bin
24306d54b8f20b3648e32173d80c88af948251a48d91357e50e71ededcdf4f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x63AF 9616 bytes