Malicious PDF — malware analysis report

Static analysis result for SHA-256 50662f41a92bb0d8…

MALICIOUS

PDF

49.5 KB Created: 2020-08-14 02:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b1c9beead2f9da880d7fb6821d020d SHA-1: ea5b4486e1b11f293e85a1c512fe9f5e28ba5359 SHA-256: 50662f41a92bb0d8019075326d5e132d72070382bd9c765f0e1d7ceeabb0b5c4
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that leads to a redirector service, which is likely used to obscure the final destination or to distribute malicious content. The presence of numerous external links, many pointing to the same redirector, suggests an attempt at SEO poisoning or a phishing campaign.

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.cc/pify?keyword=balaa+drama+ost+song
    • http://files.wileyreads.com/uploads/1/3/1/4/131482975/8119889.pdf
    • http://files.emsbabyhouse.com/uploads/1/3/1/3/131383553/4591282.pdf
    • http://files.carolinevanthoff.com/uploads/1/3/2/6/132696465/veniwulaga.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/20660378049.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/81980300006.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/71246954270.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/asian_cup_fixtures.pdf
    • https://cdn.shopify.com/s/files/1/0436/6240/9881/files/rorisenatumubitunixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/pisapikajifisapikebesof.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/94199151816.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6549/files/city_of_endless_night.pdf
    • https://cdn.shopify.com/s/files/1/0433/6120/6422/files/42239262459.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/alphabetical_series_reasoning_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/rizadurinov.pdf
    • https://cdn.shopify.com/s/files/1/0435/6879/1713/files/59747851937.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/24438619160.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_off00006986.bin
071dd24c11877e509ab0ed951cc7d757055c45f30d2602f9dc1b543335464bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6986 5192 bytes
font_01_sfnt_off00007b0b.bin
8e1574e0ddf741ae308815b2b7440e99696c12dc95d1e01c98a4049b2536ad33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 10112 bytes
font_02_sfnt_off00009dd7.bin
6cf92560e2bcc41629ec0c19eab806a6c5d01d7c9918dd94990192e231b1c48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD7 18056 bytes

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