Malicious PDF — malware analysis report

Static analysis result for SHA-256 9572d8a08829440a…

MALICIOUS

PDF

47.3 KB Created: 2020-08-14 11:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa83ba1f5ae0ee3aa94f05daf3af6ccc SHA-1: dce523f2800e5d52f3eab07c158eb7764924c4d5 SHA-256: 9572d8a08829440a861ec92c057eeb4389d913932351101db85ee2ce01ecaae5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'Ipad 4 screen replacement guide'. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or redirection attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=ipad+4+screen+replacement+guide
    • http://files.newleaforganizingllc.com/uploads/1/3/1/4/131437753/598f0c16a950646.pdf
    • http://files.mjeromebell.com/uploads/1/3/0/7/130774979/suzuforavetem.pdf
    • http://files.bevinlin.com/uploads/1/3/1/3/131379183/1d2950ec254875.pdf
    • http://files.corningoperahouse.com/uploads/1/3/2/6/132681634/25dfed204c9.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/68244072036.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/kisexanuvata.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/aspects_score_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0434/5158/0568/files/20420114897.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/55850857226.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/85092135137.pdf
    • https://cdn.shopify.com/s/files/1/0429/3427/2163/files/48982285471.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/48756432809.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/diablo_2_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/55596952433.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6463/files/wagezososeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/shl_logical_reasoning_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/gevagowemafuxorapiwesakal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/delonghi_espresso_ec_155.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_off000075d5.bin
a64b1ab8c43766d3c15b77c5d562b1953df56d8024a5b0d6c531db5704ff2a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D5 5420 bytes
font_01_sfnt_off00008829.bin
f871808640de164ebcf6f0e6c3ae40a465357c5088ef01b4ff0dc8c7dae89048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8829 12372 bytes

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