Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13f41d9e7583814…

MALICIOUS

PDF

40.9 KB Created: 2020-08-12 16:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10827469729f9cbc76398764c938e0ab SHA-1: 36ca2a4e516e212400e06c869a2e9ee43dbd14a5 SHA-256: d13f41d9e7583814b580a998fecd995f537d321ad4ea337a5787517d23468049
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, such as ttraff.com. The document body, though partially corrupted, includes the URL 'https://ttraff.com/pify?keyword=balance+sheet+analysis+for+bankers+pdf', indicating a lure to a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to distribute further malicious content or phish users.

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=balance+sheet+analysis+for+bankers+pdf
    • http://zefalit.midwestshamansconference.com/uploads/1/3/0/7/130738950/141726.pdf
    • http://files.alanurbanhomes.com/uploads/1/3/1/1/131164546/mokunitem.pdf
    • http://files.ateamlagottos.com/uploads/1/3/1/4/131406800/wukumamilemifa-wigadumojanor-ralaredofumu-wubibaxiwujed.pdf
    • http://files.katiejacksonbeautyworks.com/uploads/1/3/0/7/130776644/3783094.pdf
    • http://files.bluewatercopperworks.com/uploads/1/3/0/7/130775465/digejadez_geperix_mukulekadove.pdf
    • https://cdn.shopify.com/s/files/1/0437/5828/9045/files/tears_dont_fall.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/11112038150.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/38562988165.pdf
    • https://cdn.shopify.com/s/files/1/0437/3302/4929/files/grammar_in_use.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/using_mis_kroenke_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/hiv_and_aids_symptoms.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/concept_of_entrepreneurship_education.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3670/files/vunivexidamukukanuwagifiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38140624907.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/84270938969.pdf
    • https://cdn.shopify.com/s/files/1/0438/3650/6272/files/dr650_service_manual.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_off00006139.bin
0660dda4272787cf88d4951953b77b669cab9b5a5ed56e2bbaaf6727788fc7ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6139 5600 bytes
font_01_sfnt_off00007431.bin
9cf6e684d3b3b8c2b45834543c3953ad0f9960bf863f4a2d348bece05d6565ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7431 10060 bytes

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