Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20a7b2a17259f3f…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 08:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc7f029470ff7b24ae61f4184cf5875f SHA-1: 90321d89365ea5d16c7511fdc8c42014c105e233 SHA-256: e20a7b2a17259f3fc92ab52dcac30a3da14dcd022fb72cdec5196f07945a29ad
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=westergaard+bearing+pressures+and+cracks+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted from this sample.

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.cc/pify?keyword=westergaard+bearing+pressures+and+cracks+pdf
    • http://files.chrysalisearthfarm.org/uploads/1/3/1/3/131380181/sifutebuzikefej_xomebixujaxavek_xaseka.pdf
    • http://mowipu.tacvet.com/uploads/1/3/2/7/132741073/delekasodewitedana.pdf
    • http://files.allcustomiron.com/uploads/1/3/0/7/130738912/zaxukovazewivuri.pdf
    • http://files.fairytaleeventsaz.com/uploads/1/3/1/3/131398117/37f5812c88.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/xibadusogoterigemubij.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/17675362834.pdf
    • https://cdn.shopify.com/s/files/1/0437/9970/7805/files/definicion_de_malos_habitos_alimentarios.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/suxalebotavixiperuros.pdf
    • https://cdn.shopify.com/s/files/1/0428/7122/6535/files/hog_fattening_feeding_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/joketifozu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/munobumiwejovela.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/lujevofuwezerovizog.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/alice_in_wonderland_tagalog.pdf
    • https://cdn.shopify.com/s/files/1/0450/7890/4984/files/jane_eyre_penguin_readers_level_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/8130/2167/files/fezalujexusametunas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/rarosibesise.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_off00005f8e.bin
7ed97595708e35c765a41010c63a0e57ffde0a07dba9d4886fb1b74827ad17c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8E 5508 bytes
font_01_sfnt_off0000725c.bin
3b3683e030c5cf6ac75372624b27705bebced83152c51bdefad8f2c511602125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725C 10092 bytes

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