Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b8056f58ec563c…

MALICIOUS

PDF

44.2 KB Created: 2020-07-31 04:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0156d089aafd351ecdf93a935c5dd841 SHA-1: e779f7445726cebb1ac77ce2c1d9cbbc63c84fe4 SHA-256: 68b8056f58ec563c2a0171dccc19aa94abe9ec890a49a366ae196404d797d9f3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing indicating it's a redirector to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites, likely as part of a phishing or SEO poisoning campaign.

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=pdf+import+for+apache+openoffice+4.+0
    • http://files.paulandtashamassage.com/uploads/1/3/0/7/130739919/5268012.pdf
    • http://files.jlangevine.com/uploads/1/3/1/4/131453188/wixowafevevig.pdf
    • http://files.mymollydoll.com/uploads/1/3/0/7/130740429/31009.pdf
    • http://files.capecodpoetryreview.com/uploads/1/3/1/4/131452958/9728376.pdf
    • http://files.bookhivebeerclub.com/uploads/1/3/0/9/130969910/f65beae6b726.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/58121469042.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/65845860568.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/rokefavu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/37111219515.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/73857329944.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/74830863986.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/20622113075.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/xumudali.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/favekadugadamisup.pdf
    • https://cdn.shopify.com/s/files/1/0432/4504/3876/files/66031965424.pdf
    • https://cdn.shopify.com/s/files/1/0436/7450/1273/files/nesisipagofufufagivijexe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/25786598297.pdf
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/94908454581.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4599/files/79492503381.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_off00006edc.bin
5052c8d87aa685d1b5db90de21721f84c81e3b7a181b2828c9533eb40f334979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDC 5236 bytes
font_01_sfnt_off00008082.bin
a54cc70afca20f7e28b71026fb544319f297f0cd595d2a31496af2e036f775db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8082 10280 bytes

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