Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c1a8b245331780…

MALICIOUS

PDF

44.8 KB Created: 2020-08-09 11:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9979169678a135b49b6aa8971ec852e SHA-1: 68c6d210ad37d30ae5fe2c2287437a2786472bd8 SHA-256: 41c1a8b24533178045ae34058984f4d5f858d8bb2e00731051cf63197292f3b3
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous URLs that point to external PDF files. One of these URLs, 'https://ttraff.com/pify?keyword=aneurisma+aorta+abdominalis+adalah+pdf', is identified as a known malicious redirector. The presence of a large number of links, many hosted on Shopify, suggests an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted from this sample.

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=aneurisma+aorta+abdominalis+adalah+pdf
    • http://files.blucoffeedistributors.com/uploads/1/3/0/7/130739059/wudoforezexa_duxexogibe_dotumuzesub_tamonis.pdf
    • http://files.idontknowwhatimdoing.org/uploads/1/3/1/4/131408169/a55e967c.pdf
    • http://kevakafu.mydreamcove.com/uploads/1/3/1/3/131398140/31aaee308ac7480.pdf
    • http://files.thehillcroft.co.uk/uploads/1/3/0/7/130738871/a83f95.pdf
    • http://files.sarahsiegler.com/uploads/1/3/0/7/130775084/nirevud_pirinilil_daposegexised.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/meforo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2455/files/mufonokewikufefazazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/reser.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/69147440713.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/82620143888.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/tozejurukozagope.pdf
    • https://cdn.shopify.com/s/files/1/0440/3304/8741/files/zapuporezixeruxasozakowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8008/0801/files/nezeraniwutidaduxudotar.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8136/files/47302668936.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/siroserabifamirofos.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/9745525399.pdf
    • https://cdn.shopify.com/s/files/1/0436/9448/9755/files/61640001660.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7665/files/wevekajedubagazawegatilu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8675/files/94401945953.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_off00007066.bin
312504f793f7490d2760667a3aed5e6f859e12493427a3adeb56d3cef584580f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7066 5412 bytes
font_01_sfnt_off00008291.bin
6e4c0d12cf222266e83d6bdf915e795891558b5aafd84e8eb0e39ad8993a64b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8291 10284 bytes

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