Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50efd1c51c7f3c5…

MALICIOUS

PDF

40.4 KB Created: 2020-08-04 15:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ea133542dc3bd4a2f16de80eac5e82 SHA-1: 16007171ef3a492ddcab2b0ee25c5343ab53c3e2 SHA-256: c50efd1c51c7f3c5d55a6d8a95063605f74057db672794601abfe75aae8f1842
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=second+conditional+sentence+exercises+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the same URL and other Shopify-hosted PDF files, suggesting a coordinated effort to distribute malicious content through a network of links.

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=second+conditional+sentence+exercises+pdf
    • http://fikut.mzsacredhealing.com/uploads/1/3/2/7/132712358/towolo.pdf
    • http://files.whitthavenphotography.com/uploads/1/3/1/3/131380666/nuliwavezisojosef.pdf
    • http://files.myartscreations.com/uploads/1/3/0/9/130969301/5773958.pdf
    • https://cdn.shopify.com/s/files/1/0437/5638/8510/files/27055123736.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/rixemalezifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0118/files/sales_executive_interview_questions_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/text_appeal.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/82453199225.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/samajajizilagexalogadar.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4315/files/35171021083.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/58859948000.pdf
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/zopumunaxuduzedamebo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/broward_college_south_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/garbage_disposal_methods.pdf
    • https://cdn.shopify.com/s/files/1/0438/0013/3793/files/craft_magic_arms_and_armor_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/noxuxosifufinupafewu.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_off00005243.bin
6e2034b7dc6aa020806a2d32074131b7b1028c9f62d487c8ff6052f2c7b1c008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5243 5108 bytes
font_01_sfnt_off000063a0.bin
88c94fc47245d421902770438978dbda52ebbf8dd8eae8bb28639526acdf217f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 10200 bytes
font_02_sfnt_off0000868f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868F 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.