Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2797a0b350bbc88…

MALICIOUS

PDF

47.8 KB Created: 2020-08-06 04:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9aef4e7131f285c3252135ba677a60 SHA-1: 4adfd2ce1f66bc781b0f84d21e5a65d4bbaa5169 SHA-256: c2797a0b350bbc882bfe5a8462064e523baaf7b3958075ceb2385a24710d8531
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at ttraff.ru. The document body, though partially corrupted, contains the same URL, suggesting it is the primary lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm SEO tactic to obscure the malicious destination. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link within the document.

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=berliner+platz+3+neu+h%25C3%25B6rtexte+pdf
    • http://files.tradewinrealestate.net/uploads/1/3/0/7/130776602/3178a965e15aa3.pdf
    • http://files.shopcrochetco.com/uploads/1/3/1/4/131437702/jukodufumaxagalog.pdf
    • http://files.jewelryandwatch.shop/uploads/1/3/0/7/130775346/f7e1f1f8209.pdf
    • http://files.esparzafc.com/uploads/1/3/1/6/131636808/sofukatekavemetem.pdf
    • https://cdn.shopify.com/s/files/1/0434/0383/7592/files/nusigir.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/zuzilof.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/27657196734.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/pejigenaxabilalutopo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/61240389214.pdf
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/zonufejuramidosemikoleref.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/11873784729.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/61117642716.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/kutugodiped.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/tuxivoneronorubuvovudo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4637/7374/files/72955239346.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/49323780788.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0552/files/94895688132.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_off000079a2.bin
792bd305c7c3a74a683966f03867e194713bf70ceaeb47c0d2e1611da53de85c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A2 5420 bytes
font_01_sfnt_off00008bda.bin
80a29a038b556bb267f9c6dc0441036ded983f1f9c47b80ac8e0063f00b97391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDA 11040 bytes

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