Malicious PDF — malware analysis report

Static analysis result for SHA-256 35982fdedc4b8bc5…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 12:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbadd9ccc138574657807849b51a87a1 SHA-1: 32c328a0f403e874023826ed7f33d6797bf75063 SHA-256: 35982fdedc4b8bc548dc9c7cf8adb12ca6564f13a0f8bf530687aa0694fbc560
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests an attempt at SEO poisoning or link farming to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=cham+cham+song+hd
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/magesovekixojogarekebe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5925/6232/files/591996968.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/early_civilizations_ancient_egypt_in_context.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/ssb_psychological_test_practice.pdf
    • https://cdn.shopify.com/s/files/1/0432/5366/1851/files/banerux.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0803/files/71298960742.pdf
    • https://cdn.shopify.com/s/files/1/0433/0635/2804/files/fukumawizebadapotezar.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/pimobot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/zolivox.pdf
    • https://cdn.shopify.com/s/files/1/0437/7745/8334/files/1133_questions_an_interventional_cardiology_board_review_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/9843/8820/files/21679014713.pdf
    • https://cdn.shopify.com/s/files/1/0434/4099/6519/files/jio_mobile_play_store_app_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/mabutuzazutedefogi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/33465675432.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/85647797027.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_a065d1323f7e45bdbb0f4ff21b5e7eb2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6a7acd930df4189b0463412e8d27f4b.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_off0000509f.bin
19de03c308c3666abd72f258201f19be8e2aec0091a21d36582edf2759974162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x509F 5132 bytes
font_01_sfnt_off000061e4.bin
49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E4 2140 bytes
font_02_sfnt_off00006bbe.bin
13cb524908f12353f2cf4b01a8348873a89e90b8974a970759c61a993fc77ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBE 15920 bytes

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