Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b6a5a2a468125b…

MALICIOUS

PDF

38.0 KB Created: 2020-08-12 17:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4900b84deb879f098b7dc42cdd212f8 SHA-1: 2671d1d0040356656fad6d20cf5a84c100215299 SHA-256: e7b6a5a2a468125b31aa9f0b6d8ce7526b31c232e9e97ded5da4795cc1b939ee
152 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding a large number of URLs. One prominent URL, 'https://ttraff.cc/pify?keyword=atos+hernandes+dias+lopes+pdf', points to known malicious redirector infrastructure. The document also contains numerous links to PDFs hosted on Shopify, which are likely used to obscure the true malicious destinations. The ML classifier strongly flagged this sample as malicious.

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=atos+hernandes+dias+lopes+pdf
    • http://narefi.stjohnlutheransherburn.org/uploads/1/3/1/0/131071164/a84a0f.pdf
    • http://jegerumo.anlageskincare.com/uploads/1/3/0/7/130775085/goximapusorexo_rinadiwewe_rorosepokik.pdf
    • http://files.mikesalsgiver.com/uploads/1/3/0/8/130813325/pilifareminibe-zuxogemomo.pdf
    • http://lazedegu.renatasellitti.com/uploads/1/3/0/8/130874304/dolosa.pdf
    • http://files.photographybydicklund.com/uploads/1/3/0/7/130775734/timopijarituve-sijajefepane.pdf
    • https://cdn.shopify.com/s/files/1/0440/6634/1029/files/gokogipizip.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/rumeguzaminogezul.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/61966383547.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/87642311646.pdf
    • https://cdn.shopify.com/s/files/1/0447/4558/8887/files/the_beowulf_poet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/67833674329.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5262/files/nugulurofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/43804163303.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/stop_the_thief_level_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/wuwamoxujimutukenijadubaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/54479343582.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/97904978.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_off0000541d.bin
90243c923ae009bb4a5401deb35a6c62213c710177448de1ea9f8e70e57a0c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x541D 5120 bytes
font_01_sfnt_off0000657c.bin
ec1473d5019dac8c6f07d08391dc53791c6c1d4274661f840b91706728c7c9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657C 11740 bytes

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