Malicious PDF — malware analysis report

Static analysis result for SHA-256 282e30aa0e210dc5…

MALICIOUS

PDF

46.1 KB Created: 2020-08-06 16:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2827c4af458eae4d9cbab7cc4089e2a2 SHA-1: 4bb550c6692d8a1f8011945314ef64e9f85f7d44 SHA-256: 282e30aa0e210dc57d1176540ff03960b6970fb95ac61be1fbfaa5fa453f54d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a critical heuristic for containing malicious redirector links, specifically pointing to 'ttraff.ru'. Additionally, another critical heuristic identified it as a PDF link farm, containing numerous external PDF links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through the document content and then redirecting them to potentially harmful sites.

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=classification+of+periodic+table+pdf
    • http://files.saraayllon.eu/uploads/1/3/1/3/131380627/vuserebolitis.pdf
    • http://files.wheelchairbuddies.com/uploads/1/3/1/6/131606260/dilojetopa-devekok-kigiwizelupep.pdf
    • http://moburizug.authortomanthony.com/uploads/1/3/1/4/131407005/840678.pdf
    • http://files.knipa.net/uploads/1/3/1/4/131453024/kikudan_sewoxipoturu_rizabuzu_wepev.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0397/files/picsart_editing_tips.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/mifojuzikonubepurelu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/find_in_vector_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/17023711102.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/81109577524.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/komekuwodegamune.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2916/files/72400420949.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ferenap.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/22764657453.pdf
    • https://cdn.shopify.com/s/files/1/0438/2241/6029/files/polarity_of_solvents_table.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/zogogurafekata.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/4611439638.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.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_off00007667.bin
ea50001b802c83459614c81fd02d0e3130b36bae03960d738897ba54aef802cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7667 5196 bytes
font_01_sfnt_off00008816.bin
a6bd6d61eafcb708fdafbc83f3f1d74ace52020ec2aa425a8f21931c59c95a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8816 10332 bytes

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