Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d4a9f7130f70e3…

MALICIOUS

PDF

44.7 KB Created: 2020-08-21 23:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8161df33fff2cedee212dc2589f6862e SHA-1: 4e2ac7e4df4c169ed9a5c6466c4f00ad8b312431 SHA-256: 71d4a9f7130f70e3c1450f3c270b6e57f8a3dec02b44d0819382d2fbd856bf21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL for this redirector. The presence of a large number of external links suggests an attempt to manipulate search engine results or distribute malicious content through a link farm. The ML classifier also strongly indicated maliciousness.

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=bug+reporting+tools+free
    • http://files.creativeclayforall.co.uk/uploads/1/3/0/8/130814106/susuzuxuwat.pdf
    • http://files.automatedcablesolutions.co.uk/uploads/1/3/1/4/131407980/sisazivizika-fofonuto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6591/5045/files/61703654922.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6853/files/33198721164.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/xeziloxobok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/14772416064.pdf
    • https://cdn.shopify.com/s/files/1/0433/3581/1231/files/zaxapugamuzodakis.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/79513841169.pdf
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/pawedovibiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/yum_list_installed.pdf
    • https://cdn.shopify.com/s/files/1/0437/2496/3990/files/consumer_reports_best_baby_car_seats.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/tonirabul.pdf
    • https://cdn.shopify.com/s/files/1/0451/0449/6803/files/14611489496.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/65316443002.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/76777990901.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/betuvujilafibamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wevola.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071de.bin
95d3960d1bf59bc796577e79067f5d34d6e4dbf04008dbd98cbfc84320a495bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DE 4908 bytes
font_01_sfnt_off000082a8.bin
7cc75ffbb62d790fac156d2b7d7c33de13acc22e33e046f31c13865643285491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A8 10212 bytes

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