Malicious PDF — malware analysis report

Static analysis result for SHA-256 280ac5c0403c4fb0…

MALICIOUS

PDF

48.1 KB Created: 2020-08-01 22:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db6ef264ce919ec22efdb67d19991ad8 SHA-1: eac7afbb0eac12e1f13d1049b09cc377b9f57aab SHA-256: 280ac5c0403c4fb0191ba6d150672f5d5c937896ba001c3d52d538504278015f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text that appears to be metadata or obfuscated content, including a URL that points to a malicious redirector. The primary attack pattern involves luring the user to click on these links, which likely leads to further malicious activity.

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=blaze+of+glory+bon+jovi
    • http://files.cleanfreshbeauty.com/uploads/1/3/1/0/131070493/nimewaligat_bovewijore_puxivimifanezan_gadoxorudemose.pdf
    • http://files.stmarklutheranroseville.org/uploads/1/3/1/6/131606668/netiluxesitez-lowulixufepunu-lopekiwit-dibupagu.pdf
    • http://files.rivernationxc.com/uploads/1/3/2/3/132303009/zametaruvujunaneduke.pdf
    • http://files.langsidebedandbreakfast.com/uploads/1/3/0/8/130874495/239839.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/puzifolofelutadun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/37480382747.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47475247643.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/93735637395.pdf
    • https://cdn.shopify.com/s/files/1/0428/8312/1319/files/zowaveruv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4101/2374/files/54629846324.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4677/files/4604931791.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/karupuwite.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/zezabumerujimulidov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lenibokufilitixesokan.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/kitomeragiwebonomedativi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/80304360931.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/forawajojojovedim.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_off0000713a.bin
3d86eb21ff5dbb2dc9b2659c3f9febef81beaf3d427fa689a0f990941025de87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713A 3136 bytes
font_01_sfnt_off00007c6f.bin
210df60907866cfc171e1eb2a564a6751ddb413ca4f3cfc244290dac080e7914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6F 5236 bytes
font_02_sfnt_off00008e77.bin
6daaba0328d6e25b9244df357027f3a2b2d6c8611f7b617c401e1b1210d0b0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E77 10676 bytes

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