Malicious PDF — malware analysis report

Static analysis result for SHA-256 623fb75ec6b9a906…

MALICIOUS

PDF

56.4 KB Created: 2020-08-26 16:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3753822fb035bb999a84ebf786e5641e SHA-1: 97bb7732311ad6837ba2c6a807e7d63435158776 SHA-256: 623fb75ec6b9a906287cee925b5ea08c75c44009c25448538c4d85dda9bafef6
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. It also features a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports the attack pattern of luring users to malicious infrastructure.

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=chords+and+emotions+chart+pdf
    • http://files.kidscareacademyfmcog.com/uploads/1/3/1/1/131164418/d28eba204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/alternity_core.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/xetomot.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/one_piece_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/arduino_wifi_module_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/7006203980.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/vegojirodufigimame.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/temezukumuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/beaucoup_de_bruit_pour_rien_william_shakespeare.pdf
    • https://cdn.shopify.com/s/files/1/0428/5018/9478/files/57444368793.pdf
    • https://cdn.shopify.com/s/files/1/0429/6808/8742/files/zoxujopuwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/gebifibanabiwitopijomujed.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/zipumitedafusup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009208.bin
584380a437c922cd3d485d7e1247882022ced8dbd9aec24b7fb4c34cbe605bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9208 5172 bytes
font_01_sfnt_off0000a374.bin
ec04887dc7fc292839b2ca01f09faa7e450b18267c93d4d9c9fa91da7272fb99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA374 10240 bytes
font_02_sfnt_off0000c693.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 4324 bytes

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