Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ae95c3de493fcd…

MALICIOUS

PDF

40.4 KB Created: 2020-07-21 04:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2db46dc3fe02a026dd5444e6834d45ba SHA-1: 2c8610a3c187e3d084729c208e92a4ee03a8eb35 SHA-256: 87ae95c3de493fcdd93e3f2b4cbab2b55020970c24fd0caf838deab76338159e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is likely used to lure victims into downloading further malware or visiting phishing pages. The document body, though heavily obfuscated, contains text related to 'Mitsubishi worm gear reducer pdf', suggesting a lure to make the malicious link appear legitimate. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve SEO and distribute the malicious payload.

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=mitsubishi%20worm%20gear%20reducer%20pdf
    • http://files.friendsofparkswf.com/uploads/1/3/0/7/130776714/roxedopakif.pdf
    • http://files.almutalbrecht.com/uploads/1/3/0/9/130969874/3732813.pdf
    • http://files.treeoflifeanglican.org/uploads/1/3/2/8/132814342/f630d7.pdf
    • http://files.sweetnspicecandles.ca/uploads/1/3/2/7/132710676/9273107.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/65600750729.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/palura.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/81663150378.pdf
    • https://zenusunadaxo.files.wordpress.com/2020/06/18438122438.pdf
    • https://jifebavos.files.wordpress.com/2020/07/57266956333.pdf
    • https://zodudawizif.files.wordpress.com/2020/06/26936086716.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/xiwulonobab.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/23403667575.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/getuxunug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4011/files/11141874676.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/kifukelisinopef.pdf
    • https://cdn.shopify.com/s/files/1/0438/0445/9170/files/pikapofujap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/69423874290.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_off00005ff9.bin
18f49f95cb25a8a28bdeec35459faef219c505b67c612cb865d98167535a5cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF9 5552 bytes
font_01_sfnt_off000072e6.bin
880d693c6fd88ea97ef4101ca12a667d16f3511f9b5b40823a356888c4497846
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E6 9856 bytes