Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adea8fc24cdae97…

MALICIOUS

PDF

32.0 KB Created: 2020-08-13 23:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93e7d36dd1e831f5360cf70f20d2580 SHA-1: 65300a18e4e9736fc7069e82140490ed0094469d SHA-256: 1adea8fc24cdae9765bacaac3783105d90d429ccbd2490ab0b89789fa49d0f8c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to a 'Vaaste movie ringtone'. The presence of a link farm and the ML classifier's high confidence score further support malicious intent. The primary goal appears to be redirecting the user to malicious content.

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=vaaste+movie+ringtone
    • http://detewi.healerjbonnie.com/uploads/1/3/1/3/131380845/kezinobivov.pdf
    • http://files.rosaliesilliman.com/uploads/1/3/0/9/130969090/eec70.pdf
    • http://files.fifthwheelwa.com/uploads/1/3/0/7/130740073/20a184d0f2e13f7.pdf
    • https://ringtonedownloadx.com/wp-content/uploads/2019
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/sevakuzujubonixidok.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/frozen_shoulder_exercises_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/aihwa_ong.pdf
    • https://cdn.shopify.com/s/files/1/0433/6546/6270/files/soul_eater_tsubaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/adjoint_of_a_3x3_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0434/7504/2457/files/67581286215.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/clasificacion_hipoglucemiantes_orales.pdf
    • https://cdn.shopify.com/s/files/1/0434/6350/8121/files/97637545471.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/julikiferinekokurijut.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6165/files/60539623191.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/pdf_candy_desktop_pro_2._53_review.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1845/files/74825247749.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2343/files/ways_to_be_wicked_piano_sheet_music.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_off00004327.bin
d53afacb3598c727a406427f1fc45e6a7b333883d1135f5c63d577697f0a2931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4327 5000 bytes
font_01_sfnt_off00005418.bin
5cdf19fdbe5d16ac743bf2e0de68c9e9609c0ef660f2e0b331468543adbea9f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5418 9184 bytes

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