Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fb0c194945015b…

MALICIOUS

PDF

38.5 KB Created: 2020-08-11 20:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76631ab3343c3b9bedd1c3f47227866 SHA-1: 4bcbe1c4a70dcaa3abef0098d3848d8eb86d1529 SHA-256: b1fb0c194945015b9b4f24d71c6253c799e606a5974fb80a86b43a7728be0e6b
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 of which point to a link farm hosted on Shopify. One of these links, https://ttraff.com/pify?keyword=translating+algebraic+expressions+notes+pdf, is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'translating algebraic expressions notes pdf'. The presence of a malicious redirector and a link farm indicates an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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=translating+algebraic+expressions+notes+pdf
    • http://files.authorerikamszabo.com/uploads/1/3/0/7/130775282/nitajakute-tolovolaza-zejokusekepi-tejojabetuje.pdf
    • http://files.alboagency.com/uploads/1/3/0/7/130775427/mejitaw-gaxanolajim-puridadoxofew.pdf
    • http://files.arcaneodyssey.com/uploads/1/3/1/3/131398498/beropenomonuruj_rugeg_rarimupivom_varab.pdf
    • http://files.hightechtintplus.com/uploads/1/3/2/3/132302973/47aff28564.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/19879330712.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/93856694965.pdf
    • https://cdn.shopify.com/s/files/1/0433/7991/6963/files/kalalufupozumiviturizo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/99883488809.pdf
    • https://cdn.shopify.com/s/files/1/0440/2751/0934/files/44319285687.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/gedobesabijebixelumun.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8905/files/bobcat_toolcat_5600_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/27001577995.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/50680930805.pdf
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/machine_learning_the_new_ai.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6649/files/aadhaar_card_online_download_password.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_off000057cd.bin
0e018613c2674fa5d9dbfd1f18e04ad14ef27360e3cf52ec0ea4057c077de0dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CD 5480 bytes
font_01_sfnt_off00006a6f.bin
d8edba3b31ca5a220cd4d8270e41a48eb3d07b28d674d67fd923a33027eaa9fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6F 10120 bytes

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