Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8b88b4d2ebaf22…

MALICIOUS

PDF

44.4 KB Created: 2020-07-22 09:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db129ef4887d7d62de31add8b1c1469b SHA-1: 626ad218fa8f60adc0f9243937eaecea62f6ec09 SHA-256: bb8b88b4d2ebaf22d9f43a30ed601dd379580ab4960a962b7b246a11a03ea305
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it contains a link to known malicious redirector infrastructure. Additionally, it features a mass external PDF link farm, with many links pointing to shopify.com domains, suggesting an attempt to obscure the final destination. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links points to a redirection-based attack pattern.

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.com/wb?keyword=analisis%20kuantitatif%20karbohidrat%20pdf
    • http://files.shutterbunny.info/uploads/1/3/0/7/130739154/fitipujuwarex_wepelipe_gagewizu.pdf
    • http://files.reedheightstiburonknolls.com/uploads/1/3/0/7/130776452/lozuni-tofikikutuxisax.pdf
    • http://files.esquiregames.com/uploads/1/3/0/8/130874307/69d688e83fac.pdf
    • https://depuzalero.files.word
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/jufukegaderewawekabokux.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/96833803629.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/tiwerimelixu.pdf
    • https://katigubaf.files.wordpress.com/2020/07/32347340595.pdf
    • https://depuzalero.files.wordpress.com/2020/07/rujomekonipifona.pdf
    • https://zimufugu.files.wordpress.com/2020/06/zaxiji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/56028269691.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/duruporem.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/55258841049.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/dezubemakam.pdf
    • https://cdn.shopify.com/s/files/1/0436/8033/3989/files/75817189009.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/lipaxikadonowejarogusotum.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/totaledumunurofom.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/79180113043.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.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_off00007088.bin
f99fa0b2f77e16acd86490239eae49b8d7286ad9bfb8b6481c80f8dd7b3d3d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7088 5088 bytes
font_01_sfnt_off000081ae.bin
b51856596bd478ae857b99aaf99327ea518fd465591bd9e4fd1ef85e8a38fd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AE 10204 bytes

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