Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d5b9c72e36eaf6…

MALICIOUS

PDF

44.6 KB Created: 2020-08-11 16:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15500694007b0b16e062b1b5bfe4a233 SHA-1: 086e2a53e61f1678bd795acd3e5a0877544eca89 SHA-256: 88d5b9c72e36eaf60dc6683bbe8628394d9f4e5be437cd9e45683a77ce27ae72
152 Risk Score

Malware Insights

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

The PDF contains a deceptive link presented as a "Pixar storytelling book pdf" which redirects to a malicious URL. This is further supported by heuristics indicating a malicious redirector link and a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF 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.com/pify?keyword=pixar+storytelling+book+pdf
    • http://files.srtravels.co.uk/uploads/1/3/2/8/132814900/sironuzanafiw_funonagusa.pdf
    • http://lejufuna.villagespin.com/uploads/1/3/1/0/131069935/315791.pdf
    • http://files.bcjrlancergirlsclub.com/uploads/1/3/1/3/131384024/3863282.pdf
    • https://cdn.shopify.com/s/files/1/0431/8711/0037/files/61288298093.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/puxupujofoguwedaxumelafo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4743/4905/files/adverbs_of_time_place_and_manner.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/496758303.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0437/8116/1111/files/50946707527.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/mulegilojol.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/keputuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65107231385.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3071/files/tipatuvo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/60538998211.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_off00006f74.bin
5f9565b9f25b3fa9a93448d16ba0fc22ebbe1709b21a32f56dfbac33bd6e4dec
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F74 5584 bytes
font_01_sfnt_off0000828c.bin
f731c6245777bb4b3cdd03c46e502305adab8163eff74ca2e3552f227de1f4b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x828C 10096 bytes