Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8dba00067fd74a…

MALICIOUS

PDF

48.2 KB Created: 2020-08-18 18:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da6b43bd08fdb4e618b2a0c2615f1231 SHA-1: d6d57944709f468b05c940bc71f29f995f1e99ad SHA-256: bf8dba00067fd74ab39834af182780df8ffa1deb6e023ef14c3818b4409043c6
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to host further malicious content or phishing pages. The document body, though heavily obfuscated, contains the same URL and keywords related to recruitment, suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for 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=aiims+recruitment+rules+pdf
    • http://bugazoku.nycsigmakappa.com/uploads/1/3/2/8/132815961/2919508.pdf
    • http://files.custompaintingsbyden.com/uploads/1/3/2/3/132303013/nizejagisu_vavesida_fekoromeg_ribivekulivu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6460/6372/files/resident_evil_remastered_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/23953392148.pdf
    • https://cdn.shopify.com/s/files/1/0439/0889/0792/files/ciencias_formales_y_fcticas.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/monujalibi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/458686325.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/arcing_ground.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/xaguzijekifotol.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/tedusotekinuralibawumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/pupiwixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/xitexona.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/fotirodabinotekosivudenul.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/zokuwurokulaxixoz.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/
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/tedusote

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e1.bin
aed3080eedbd1c26c2e9531b177e92f12baae761ce88f149999f6ee45f6a1b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 5080 bytes
font_01_sfnt_off0000720c.bin
ca01bcb13f36170581f80e0a6f31c1000cf7661f24a41cdf359b9234ef752a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720C 10552 bytes
font_02_sfnt_off00009535.bin
6c363cad580832c79610fb4f2b27e8ff0581ab0f693c9b8ceeef6bfeeb2016b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9535 9364 bytes

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