Malicious PDF — malware analysis report

Static analysis result for SHA-256 3822aae609fc34b9…

MALICIOUS

PDF

44.4 KB Created: 2020-08-06 03:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d4ddf2b603e402c1f3c8b3ab658f48 SHA-1: e42809c7a1540ce101191b3f9f2a4171aa7a7697 SHA-256: 3822aae609fc34b9e8bda776ad95ba6181e57b52acd8c0771a0391685c20d2b8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=the+birchbark+house+journeys+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm or SEO poisoning attempt to drive traffic to the malicious redirector.

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=the+birchbark+house+journeys+pdf
    • http://files.uclagoingglobal.org/uploads/1/3/1/4/131452733/tutajomajaz-wenoneno.pdf
    • http://files.zoepantinjewelry.com/uploads/1/3/0/9/130969592/8075ec.pdf
    • http://files.moshathestylist.com/uploads/1/3/1/1/131164048/sevarepanuku.pdf
    • http://mupew.rochellesteder.com/uploads/1/3/2/7/132740873/9115499.pdf
    • http://files.memay-mysteries.com/uploads/1/3/1/4/131407424/967345.pdf
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/40184036752.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/52294740436.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/lucky_block_servers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2012/3285/files/tanetorasakumumukunemaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/1_gallon_to_liter.pdf
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/soril.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/waguguxapedatufolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/sebumafofunar.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/48311925053.pdf
    • https://cdn.shopify.com/s/files/1/0440/2089/1798/files/97658590489.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/63532356392.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_off00006bed.bin
31d3564ca896f48a6e366023b45c173b420ef3158233ada94b71c730d218df69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BED 5544 bytes
font_01_sfnt_off00007ec9.bin
d8c5077ff86a68ab5ab8659e48c35ffca822b7f2092a94b0c917c5675ac38d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC9 11096 bytes

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