Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1635a777d1a132a…

MALICIOUS

PDF

52.4 KB Created: 2020-09-10 20:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03074302d9a819821c4b5754bc6f2a5b SHA-1: 224a555ce736ac435ecfdd2eb12b0f943e83fa4c SHA-256: c1635a777d1a132a4f371210609b5b003e916bf440eb07c6f8db900bd1530f2c
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body, though heavily obfuscated, contains text related to 'audiobook iphone' and the URL itself, suggesting a lure to trick users into clicking on these links. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a social engineering attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=cannot++audiobook+iphone
    • https://static.usrfiles.com/ugd/1e8759_34432767f155402ea3d559ed886d1feb.pdf
    • https://static.usrfiles.com/ugd/fd30ac_d50a739cf3bf4d85bfebe8c3df3b2d5c.pdf
    • https://static.usrfiles.com/ugd/3de8a6_23874b15125c4e3aba1f7ca819e09cfb.pdf
    • https://static.usrfiles.com/ugd/8ebb60_0132e864e090405fa7033a4da91e0262.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/81442356152.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/vumaturagov.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/raxaxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/82597875710.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/janekuviribajekapop.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/xebirixeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1513/files/wuripigutuxazixor.pdf
    • https://cdn.shopify.com/s/files/1/0462/8407/9264/files/gixifuxajiridusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9275/4076/files/59989674268.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7701/files/meladavarazibuvebi.pdf
    • https://cdn.shopify.com/s/files/1/0471/0521/2566/files/bibujuvevijalebawulik.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/31688737468.pdf
    • https://cdn.shopify.com/s/files/1/0431/7000/5156/files/99762868733.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c71.bin
80ebcaea2aff117b857a1003747b74975cc0ab757f19dc7d33d130ae0d792559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C71 4848 bytes
font_01_sfnt_off00007ce6.bin
b854703946c57c44c1f218c44428146befd42d2ac58c33f42e189486e17f4db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE6 10420 bytes
font_02_sfnt_off0000a0b7.bin
c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B7 16392 bytes
font_03_sfnt_off0000b662.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB662 4324 bytes

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