Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2b024f12b8cbc9…

MALICIOUS

PDF

46.5 KB Created: 2020-07-29 03:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5631d91d5765a7f553f13ef52e11f7 SHA-1: 900c38939952b36f38ae82504c159cd78ad4bb8d SHA-256: eb2b024f12b8cbc9f9bc3f3f70ba6382a4a212de1ff28435f65dc604f60b1ce1
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, references IT support, a common lure. The presence of numerous embedded links, many pointing to Shopify domains with generated filenames, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=it+support+interview+questions+and+answers
    • http://files.insj.org/uploads/1/3/2/7/132712282/gipax.pdf
    • http://files.extremeflyerdesigns.com/uploads/1/3/1/3/131382239/364088ecd.pdf
    • http://files.latavolamarche.com/uploads/1/3/0/7/130738919/pamig_pujisi_mimapivuzuwulu_lotutevok.pdf
    • http://files.pre-protein.com/uploads/1/3/0/8/130814529/dukovowudawaniluke.pdf
    • http://files.aromathymebistro.com/uploads/1/3/0/7/130738996/e459e5e4.pdf
    • http://files.pre-protein.com/upl
    • https://cdn.shopify.com/s/files/1/0434/1461/8262/files/tomezudulunuwojasapef.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/nitutufoxin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7891/0106/files/norafanewegexerananeza.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/vuxibiguso.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/24202317808.pdf
    • https://cdn.shopify.com/s/files/1/0434/6377/0274/files/jupapatirufidikasomoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/12040339077.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/setejadafef.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/xirede.pdf
    • https://cdn.shopify.com/s/files/1/0436/1024/3230/files/belof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/gitepupesavut.pdf
    • https://cdn.shopify.com/s/files/1/0428/5726/7359/files/fusafokavika.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/86392449221.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/79341701132.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_off00007949.bin
5dfb4195215186fa3e836f1b9b539b017d4b4ce9a1ac7219274b07c98fe27f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7949 5016 bytes
font_01_sfnt_off00008a71.bin
880e0b29be82f7face20639a071a68200173b169807b362e672755a1e3881630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A71 10028 bytes

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