Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7b28f8741e950e…

MALICIOUS

PDF

47.3 KB Created: 2020-07-20 05:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3a6fd00643365f77be8eb03cf2e8d22 SHA-1: 7a8de4d22c4d2050d383ea1ebfea3c40b01bab7c SHA-256: 5c7b28f8741e950e700abf9caeea0a86e2a5dc05face9fe1dfcf240452fe1f7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to PDF files hosted on WordPress.com and other file-sharing sites, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to "Mbbs 1st year books pdf 2018", likely a lure to encourage clicks on the embedded malicious link.

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/wb?keyword=mbbs%201st%20year%20books%20pdf%202018
    • http://files.smajali.co.uk/uploads/1/3/0/7/130776630/fijit.pdf
    • http://files.markpenzak.com/uploads/1/3/0/8/130813461/kuveletana.pdf
    • http://files.poulsborvspecials.com/uploads/1/3/0/7/130776041/lifovez.pdf
    • http://files.otterworksusa.com/uploads/1/3/1/4/131437351/tasegus-rekafi-zeganusisaj-jigavulef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://repaxazaw.files.wordpress.com/2020/07/woxadapumudojomiropawibu.pdf
    • https://titunejerok37025062.files.wordpress.com/2020/07/woxelo.pdf
    • https://rojapasu.files.wordpress.com/2020/07/jobasofejanipuximewa.pdf
    • https://jukawuf.files.wordpress.com/2020/07/60841303957.pdf
    • https://jufidobe.files.wordpress.com/2020/06/xixeworigi.pdf
    • https://sosivudo.files.wordpress.com/2020/06/vidobukoxifujusisesuwetum.pdf
    • https://zimoligedozo.files.wordpress.com/2020/06/ronopijelixipotabumojepaj.pdf
    • https://wujeniva881121669.files.wordpress.com/2020/06/lotizipilawu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/22815635057.pdf
    • https://cdn.shopify.com/s/files/1/0432/5919/9650/files/77993219299.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/54935668636.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/72232117786.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/wenujeki.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/68301727465.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/84926625205.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/vopuzozapepuxalir.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/tufowigonakiwezapajale.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_off00007b4f.bin
d6ac648dd8ef4a1cc2851fe941a8011fe4b7b83f140bce2962e08773fbfce9d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4F 5468 bytes
font_01_sfnt_off00008e08.bin
24407e7efb8cf07bf864fe22736957628925c5defc5746a0cc193c8f7a937046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E08 9784 bytes

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