Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a5a4e32f59af57…

MALICIOUS

PDF

53.9 KB Created: 2020-07-31 10:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3409295d1a7687c8f6b2996845183bf SHA-1: fcf777d6495ea0f4416188814f1769ee8791581c SHA-256: d9a5a4e32f59af57ad782a0ffe7880d47211ed75cba82e48cdb2da0f7c45c95b
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing malicious redirector links, specifically pointing to 'ttraff.ru'. Another critical heuristic identified it as a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of a malicious redirector URL is the primary indicator of compromise.

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=candide+pdf+en+arabe
    • http://files.greengateolivegrove.com/uploads/1/3/1/4/131437626/zojaneduv.pdf
    • http://files.mariannewardart.com/uploads/1/3/0/7/130775063/5304530.pdf
    • http://files.theefficienthouse.com/uploads/1/3/1/4/131406892/24d70bdfdf06.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/90902845847.pdf
    • https://cdn.shopify.com/s/files/1/0434/7786/0516/files/tofije.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/21530177252.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/sinozefikenaganapo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/61597310181.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/37294821375.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/95458083401.pdf
    • https://cdn.shopify.com/s/files/1/0430/3136/3747/files/dagadari.pdf
    • https://cdn.shopify.com/s/files/1/0437/8987/7397/files/lonirizinu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/85567545347.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/suvupekadunujuvukibipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/wovumok.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/f

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00009bd2.bin
274db5a31de12458388eec1ea3514cd4bed72cfd1bece074296e798fcb78681a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9BD2 26560 bytes
font_00_sfnt_off000068de.bin
7b86e792f52833a54089d0de69384d98c13830f9cd384b730ead9db18646a0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DE 4588 bytes
font_01_sfnt_off00007870.bin
7dfff22f063dddc75985592ca99adcc3f7a340f965926bc9e5293faffdd43a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7870 10400 bytes

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