Malicious PDF — malware analysis report

Static analysis result for SHA-256 3259bd9c7f41b501…

MALICIOUS

PDF

68.2 KB Created: 2020-08-14 13:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e9d8bf48c7c6a453566ff61f5e1b39b SHA-1: 10487ba16960ac4efc8cf3d84006b72ba7beb7e0 SHA-256: 3259bd9c7f41b5017c01dd676118229965b6f2fbf7f624b44434608e64ccbfdf
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is a common tactic for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'complementary and supplementary angles worksheet answers', suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or distribution network.

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/pify?keyword=complementary+and+supplementary+angles+worksheet+answers
    • http://files.mustardseeds.co/uploads/1/3/0/8/130874012/4329351.pdf
    • http://sevekas.aiacsrep.com/uploads/1/3/0/7/130740178/f053d257ffe65.pdf
    • http://files.beachcatgallery.com/uploads/1/3/0/7/130775659/jalevisagoxes.pdf
    • http://files.goldstatus-of-arts.com/uploads/1/3/1/4/131483491/zetizudonadafuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5822/4549/files/49850441311.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/velarisezumolizisulija.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/94330963192.pdf
    • https://cdn.shopify.com/s/files/1/0433/9574/3907/files/56898446554.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/3947232397.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/tatakebarumabeligupif.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/cs_go_saloon.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/79153687825.pdf
    • https://cdn.shopify.com/s/files/1/0428/1656/9500/files/zetatamixenoxufuzemorakuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/pusuresegozubilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/benzel_spine_surgery_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/dispatch_is_not_defined_redux_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/cassation_decision_volume_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/rosanuvibapo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c137.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC137 2828 bytes
font_01_sfnt_off0000cb32.bin
2fca9b8b08eb2f6d0ec20aef363e8b247e19670d44a3e78dc71ef6dccba5361d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 5536 bytes
font_02_sfnt_off0000dde7.bin
4eef084337984fe7d88acd86b2a28c4c788f782eb7a159aa629cffaa293328ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 9940 bytes

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