Malicious PDF — malware analysis report

Static analysis result for SHA-256 41099cdafef3b338…

MALICIOUS

PDF

57.6 KB Created: 2020-08-24 08:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e463eafcea4f1a84795ca098f3f013eb SHA-1: 7a8c01d32a78af169a2328e6b95f31a3bda96f2b SHA-256: 41099cdafef3b338bc7d47d8c058c73941eec3411f37a58b49866b38428cff82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a 'Ladakh travel guide'. This heuristic, combined with the ML classifier's high confidence, indicates a malicious intent to redirect the user to a harmful site. The document body, though heavily obfuscated, contains the same URL, reinforcing the lure. The presence of a PDF link farm further suggests an attempt to manipulate search engine results or distribute content through multiple links.

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.ru/pify?keyword=ladakh+travel+guide
    • http://files.dulyon.com/uploads/1/3/0/8/130874113/nerefif.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/87724340291.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/pojiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/jedikevuminugugam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5111/4908/files/noguvamajori.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/beboncool_wireless_presenter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/pamagotakad.pdf
    • https://cdn.shopify.com/s/files/1/0465/5546/3830/files/bosch_classixx_fridge_freezer_maxx_freedom_performance.pdf
    • https://cdn.shopify.com/s/files/1/0439/1672/2331/files/wojepelebigafejeromix.pdf
    • https://cdn.shopify.com/s/files/1/0435/1059/5748/files/21951782170.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/22449273921.pdf
    • https://cdn.shopify.com/s/files/1/0461/9904/6297/files/honda_crv_2016_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/jquery_slide_down.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/xaxoretudufemofivexixag.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/
    • https://cdn.shopify.com/s/fil

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097df.bin
fb6343ea4728b9da14287b078e2bdba3fbe2144ac0a1cff44066f8591b58391b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DF 4640 bytes
font_01_sfnt_off0000a7bb.bin
038832a605754dfb293e2b7a6f2b14be89493e4bea267d1efaac92cbe58b298d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BB 10444 bytes
font_02_sfnt_off0000cb5c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 4324 bytes

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