Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffe3be2880527e7…

MALICIOUS

PDF

43.2 KB Created: 2020-09-05 14:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 360d595b6a87659b80933be22d55c1fe SHA-1: c32f70032303f4f7688aa5a9d888bafac5df767d SHA-256: 8ffe3be2880527e731c6ac2f1355820cefd1fc4ba50e953fa41c48002aa0cefa
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'educational technology' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link.

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.link/pify?keyword=educational+technology+2+lesson+6+answers
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/10757301325.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/zagazadiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/2810601193.pdf
    • https://static.usrfiles.com/ugd/79cb75_13e077e81090437b800f0841c825a71b.pdf
    • https://static.usrfiles.com/ugd/90423f_5032422047754ae78d29eb01cc429dbd.pdf
    • https://static.usrfiles.com/ugd/12daa7_6bb623e5c0a44e16befe0e38f7eee210.pdf
    • https://static.usrfiles.com/ugd/455f95_590d54460bdc4627a92915dc542adaaa.pdf
    • https://static.usrfiles.com/ugd/2f07a1_a057bdd51e0441069c428b69c5e3b161.pdf
    • https://static.usrfiles.com/ugd/dd4472_bd13eb7ba3da44d49dcbbd4540bbd838.pdf
    • https://static.usrfiles.com/ugd/b8c837_770ea67dbfeb46729b6744aec996c398.pdf
    • https://static.usrfiles.com/ugd/15cd4d_ad1d152930c24d96b689a5a709561be6.pdf
    • https://static.usrfiles.com/ugd/aef5b7_cd551853717a405bbca01b3c7f896d3a.pdf
    • https://static.usrfiles.com/ugd/d1fcfc_e1b0644fc2194464be8bf6f7cc45cf82.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f066c0bc46c47048f988b9d4575c723.pdf
    • https://static.usrfiles.com/ugd/6f7357_f09e1496ea3b4ea9a4b2a0207d7d2b0f.pdf
    • https://static.usrfiles.com/ugd/3e7897_04fd295ccc2c49c8b61e1e3dd6232a69.pdf
    • https://static.usrfiles.com/ugd/e4a001_1672d727a2744fe09d90ca5ec4494081.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_off00005bba.bin
4364df7716d9a6f25151c742f6724ef7da5ec1a12bb31eb8d81d6497a4046082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBA 5520 bytes
font_01_sfnt_off00006e87.bin
33370a74f0ff712ee95fecdb00a113eeb7881e85c90821e4951c424cc61b6407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E87 10584 bytes
font_02_sfnt_off000091c7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C7 4324 bytes

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