Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b495ee8aac812a…

MALICIOUS

PDF

42.5 KB Created: 2020-08-01 07:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ebdfba2b9b4154622b827be1520b396 SHA-1: 8f72bf3d60e4ba4b600c850161c7dc0151e7e42f SHA-256: f0b495ee8aac812a9a1f3343c1dad1328768c30f43c150a4253de29cf2da0ce1
152 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of embedded URLs pointing to external PDF files. One of these URLs, 'https://ttraff.ru/pify?keyword=word+wrap+css', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document's content appears to be obfuscated or corrupted, but the primary malicious activity is the distribution of numerous links, likely for SEO manipulation or to lead users to further 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=word+wrap+css
    • http://files.evemuson.com/uploads/1/3/2/6/132682338/1c9ea5430cb735.pdf
    • http://files.fhaca.org/uploads/1/3/1/6/131606343/pidubozala.pdf
    • http://files.planninginblackandwhite.com/uploads/1/3/2/7/132710655/bobuzugipiz_renele_litazafurusagop.pdf
    • http://files.amyplanttherapy.com/uploads/1/3/1/4/131453784/dajezunofifapamuso.pdf
    • http://files.intheribbonsshowclothing.com/uploads/1/3/1/3/131380120/3908156.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/fevizavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68736518606.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/kadixogijedebamogaponani.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6258/files/judatevuzur.pdf
    • https://cdn.shopify.com/s/files/1/0430/9024/7829/files/126020174.pdf
    • https://cdn.shopify.com/s/files/1/0434/7166/7360/files/lapukebekutemulojomopuzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/likupeziwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/xamagajekafusetoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/84677011211.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/nojefowir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4573/files/xobetadifidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/somerurunem.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_off000062fa.bin
c0f2d3f5c3fa2c41c9fc85a660d7edacdf3d991f5d552856409d4e7147d6f3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FA 5140 bytes
font_01_sfnt_off0000749e.bin
5ab43a233f4d16c65c362af0d56ec60f1985b0e25d06459889a9d71be1ac0573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749E 12764 bytes

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