Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e1b77ae94eb2ee…

MALICIOUS

PDF

44.1 KB Created: 2020-08-15 02:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af017b79971fa4ed4ba27f72d2a5f21e SHA-1: 1ea8e376ae693155ed333bafcb5911dee54a4ff9 SHA-256: d0e1b77ae94eb2ee7880db274bd084e7b29f837de08ada6163dcd3b2f9d684ea
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to a malicious URL, disguised as a cheat sheet. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL and several other PDF links, suggesting a link farm or redirection strategy to deliver further payloads.

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.cc/pify?keyword=trig+derivative+identities+cheat+sheet
    • http://files.friendsofsfestuary.org/uploads/1/3/0/7/130776823/371612.pdf
    • http://gevefujo.nhca-lions.org/uploads/1/3/0/7/130740537/1908699.pdf
    • http://files.delsocialmedia.com/uploads/1/3/1/0/131070151/4747031.pdf
    • http://dufegigib.3realms.ca/uploads/1/3/1/0/131070109/dorafepofi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/tezakariroxafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/87468115048.pdf
    • https://cdn.shopify.com/s/files/1/0439/8042/3326/files/67114696506.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/bedubefepizutob.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/17117068150.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5991/files/fadoramifenirejipetek.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/vonudutobupeva.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/mifajerofanakisa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/likif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/free_postal_exam_473_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/1143/1838/files/ara_ra_ra_marathi_dj_song.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_off0000638e.bin
679b98de4f64850a68c8e83346d73dce4d78633fa0505f9ebfef61ac06014f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638E 5180 bytes
font_01_sfnt_off00007523.bin
ccc970c3ef9a3f7bdbf4158e682c02a2da8382bb4aa57b3ca41cbdbe0f41a92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7523 14800 bytes

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