Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9bdaa939a4dda8…

MALICIOUS

PDF

45.2 KB Created: 2020-08-06 15:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4ee154378e1bbff56ab975e6ff0c58e SHA-1: b553b65a7ad63bfc41ac7f1ee108a7fe5c66e2fb SHA-256: ec9bdaa939a4dda8b9f401d946607e021cac6b6b6ebc6cbea183d4b35786ac96
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to converting PDF to word and the malicious URL itself. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a lure to a malicious redirector disguised as a free app download.

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.com/pify?keyword=free+android+app+to+convert+pdf+to+word
    • http://files.cateringandcreations.net/uploads/1/3/0/8/130814513/9295549.pdf
    • http://savibi.natashashapiro.com/uploads/1/3/1/4/131407668/jepulavogiforo.pdf
    • http://files.gutierrezandsons.com/uploads/1/3/0/7/130776490/rurofemixapu.pdf
    • http://files.thatcorps.org/uploads/1/3/0/8/130874328/7685c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/4369726130.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/xmus_jaxon_flaxon_waxon.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/murolipodusesariwifosixum.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2509/files/geturojaxuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/4157/0466/files/sozasorawudobusubipipik.pdf
    • https://cdn.shopify.com/s/files/1/0430/7153/7301/files/pdf_ke_word_online_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/wirelose.pdf
    • https://cdn.shopify.com/s/files/1/0430/8071/2343/files/65607073660.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/nubejafuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/25613070845.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5650/files/61338306062.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/mulizaxifomud.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_off000071f0.bin
bd32648ece35dc152c9fe6de26e009b638d3ec7c97d5f6bcb805ee2a53b1d915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F0 5048 bytes
font_01_sfnt_off00008348.bin
d284e9fe10d4b3cc1e5f2eccd5cedd2137546354991eaeb478cda4aa60854e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8348 10572 bytes

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