Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedf37d90f1d9896…

MALICIOUS

PDF

45.1 KB Created: 2020-08-27 13:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f65b48d05ac74f13b8ba0b6e0f8e1bbe SHA-1: afcec094fcbd70e65b22460d1a6aae4aa7006bc3 SHA-256: aedf37d90f1d989649721a7851fdf6937930811b5c8c5aaf36bd04215532a86b
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. A critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=age+of+wushu+vagrant+guide', indicating a likely phishing or malware distribution attempt. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm strategy, potentially for SEO poisoning to lure unsuspecting users.

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.ru/pify?keyword=age+of+wushu+vagrant+guide
    • http://files.williambartlettfineart.com/uploads/1/3/2/6/132696483/7420171.pdf
    • http://tinosezir.trimstechnology.com/uploads/1/3/0/7/130738629/pumidamizubugidipuba.pdf
    • http://files.mathtalks.net/uploads/1/3/2/3/132302940/dutegudefuladepikap.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/75957744853.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/19667626678.pdf
    • https://cdn.shopify.com/s/files/1/0464/5044/2408/files/types_of_intermolecular_forces_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/fejokatutepiwinetek.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/regions_of_the_abdomen.pdf
    • https://cdn.shopify.com/s/files/1/0435/1203/7540/files/marathi_katha_kadambari_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2622/6075/files/super_car_racing_games_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/nobegegukete.pdf
    • https://cdn.shopify.com/s/files/1/0432/2869/2643/files/86286835581.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/665656208.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3567/files/22439745356.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/riwadokoxaviruga.pdf
    • https://cdn.shopify.com/s/files/1/0452/6243/8560/files/synaptics_touchpad_driver_windows_8._1_asus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f0.bin
caf5b713cd4fa87363745ce9380a96e3e9aa3e07d8ff7b84069b4ffa1d5963f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F0 5160 bytes
font_01_sfnt_off0000768d.bin
5adf6de57b3d6e0984884d656281930ac004339976255f52041545a5a019aba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768D 10264 bytes
font_02_sfnt_off00009999.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9999 4324 bytes

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