Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dca57d350a1afa2…

MALICIOUS

PDF

44.5 KB Created: 2020-08-01 20:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 240171e5c427d76f3c7b1b7fec0801eb SHA-1: 1a0346121404c0365414fde0de798c3b410eae12 SHA-256: 5dca57d350a1afa2d274e610cde1b821b88af77ce28e39a8902df084aea27b85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'Steam download speed', suggesting a lure to trick users into clicking the malicious link. The ML classifier also flagged this PDF as malicious with high confidence.

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=steam+download+speed
    • http://files.hughsonchronicle.net/uploads/1/3/1/0/131071157/1d9843cb.pdf
    • http://files.joeantico.com/uploads/1/3/2/3/132303351/62187fc733f7e3.pdf
    • http://files.journeythroughsurrogacy.com/uploads/1/3/1/4/131406537/fenuwa_zonepeku_rewoxuferomona_rosonokefex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/julelajewapesekazujowi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/16419615914.pdf
    • https://cdn.shopify.com/s/files/1/0434/4132/4184/files/fusadenavigasif.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/56205250078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/85373864390.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/lusoxififarirema.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/56957593600.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/kinogosazuvizerixuzune.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0632/files/26719056259.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/pawaripafuzewudosezalarag.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006469.bin
11b33346164cd1d7276edd84bfdd5e1d9926b1432a308741b2831b80c9a33785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6469 4944 bytes
font_01_sfnt_off00007530.bin
ada9bb416489594b5f095010250400f330344b2b37edae142e8a86686e1fe638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7530 10052 bytes
font_02_sfnt_off00009784.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9784 4324 bytes

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