Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba3b62cf375e7fd…

MALICIOUS

PDF

45.5 KB Created: 2020-08-06 00:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3735b1dba7afaabd1e83d0157b711029 SHA-1: 0b6c0645fe375b17c8889a626a3e1945b671275d SHA-256: 8ba3b62cf375e7fd72e8a5ac00559869ffb399cbe22de9882b6d75d3e24a0cbf
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at ttraff.com. The document body, though partially garbled, suggests a lure related to converting PDFs to images, likely a pretext for phishing or malware delivery. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead the user to a harmful destination.

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=ph%25E1%25BA%25A7n+m%25E1%25BB%2581m+chuy%25E1%25BB%2583n+%25C4%2591%25E1%25BB%2595i+pdf+sang+h%25C3%25ACnh+%25E1%25BA%25A3nh
    • http://files.recycledcabinetsolutions.com/uploads/1/3/0/7/130776077/luguzulelotof-jezoxedozikag.pdf
    • http://files.krislagerband.com/uploads/1/3/1/3/131381605/kiwokubavure.pdf
    • http://files.uchabitat.org/uploads/1/3/2/8/132816066/5152028.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/64213261760.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/python_tree_implementation.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1968/files/39588635472.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/dipovipezek.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/54959561876.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/bosomo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/9786125741.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/fume_ultra_greatsword_ds2.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7563/files/55399787836.pdf
    • https://cdn.shopify.com/s/files/1/0435/1164/4324/files/value_added_products_from_fish.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/bixojovejagoxagumojexiseg.pdf
    • https://cdn.shopify.com/s/files/1/0433/4354/4488/files/94816032094.pdf
    • https://cdn.shopify.com/s/files/1/0438/3725/9936/files/guinea_pig_devil_s_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/64795838953.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/gudelakagepubodukadesa.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_off000061d0.bin
7d7626a46c4dddcfe8498c0f5a7972392852e7e628fb674b9895c2b38b59702b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D0 6856 bytes
font_01_sfnt_off000076b9.bin
5392a385995bc352ef66a911a4550a5ff218fa4693678845a266db59429d81f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B9 21896 bytes

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