Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1122f12ca706004…

MALICIOUS

PDF

35.4 KB Created: 2020-08-12 16:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 240cfd1de17a34809945c862d4327da2 SHA-1: fec2bf4c84a45f430cc4905e1b3d67d6f1f8e5f6 SHA-256: c1122f12ca706004093e77ffb0fc5e632e4751c17dd2204d5ba5bb00898a7a91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a C++ online test. This suggests a phishing or credential harvesting attempt. The document also contains a large number of links to PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted, but the presence of multiple malicious and suspicious URLs indicates a high likelihood of a malicious redirector being used to deliver a payload or phish for credentials.

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/wb?keyword=c++%20online%20test%20questions%20and%20answers%20pdf
    • http://files.david-jennings.net/uploads/1/3/1/4/131482975/patubujopir.pdf
    • http://nadobe.ourmomentsintime.net/uploads/1/3/1/4/131408899/muvodoreki-zuzojutage-winebazavave-rusosepesamito.pdf
    • http://files.giav.net/uploads/1/3/1/4/131454501/kivomeniwegozipele.pdf
    • http://files.westendcroquetclub.com/uploads/1/3/1/8/131856987/zonimej_zimuzono.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1374/files/divubonebidibifap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/zimoxepovolepajid.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/social_entrepreneurship_defined.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/arrange_in_descending_order_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/auditory_learning_style.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/99585978178.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/jasozabomavopuvewo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9393/4748/files/nurse_anesthesia_pocket_guide.pdf
    • https://cdn.shopify.com/s/files/1/0447/2376/5402/files/burger_king_gutscheine_august_2020.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_off00004c52.bin
7cf10fb69e2b4c955422baa9d69d9c1ee365b051f8b21ea846cceef6eb7c2e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C52 5160 bytes
font_01_sfnt_off00005dfe.bin
03d2e71ceb2197a0948a6e1a8591ffe443086ce529a9592e1b2484a0a5211692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFE 10156 bytes

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