Malicious PDF — malware analysis report

Static analysis result for SHA-256 357f4d4e36f5faf5…

MALICIOUS

PDF

70.3 KB Created: 2020-08-01 08:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1be56817df77959cdf2213a24046226 SHA-1: b97e3839063cc50cc7b6ff5498f97d6689c08960 SHA-256: 357f4d4e36f5faf591a85bff7065be954f45782f10ff05a18fdc7104aa806a60
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The document body contains the URL 'https://ttraff.com/pify?keyword=which+countries+use+mm%252F+dd%252F+yyyy' and a list of other PDF URLs, suggesting a lure to a malicious site or a phishing attempt.

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/pify?keyword=which+countries+use+mm%252F+dd%252F+yyyy
    • http://files.solidgroundpsych.com/uploads/1/3/1/1/131164519/0ed16811a8ff12b.pdf
    • http://files.spacesofhope.co.uk/uploads/1/3/1/4/131406518/04a90a85c577.pdf
    • http://files.sassypineappleshop.com/uploads/1/3/1/4/131452741/muzaz.pdf
    • http://files.anaheimvacationvilla.com/uploads/1/3/2/7/132740580/dee1750f253.pdf
    • http://files.hythummusic.com/uploads/1/3/0/8/130874524/85eb688b73e93.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/minecraft_gendustry_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/rubifufewederevilafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/kudutakiwakonategegin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0438/0996/4192/files/wekoteweramuginikikimoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/58836403419.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/lixidixokawus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0519/7985/files/moxizigomoxibotuxido.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/janelozefevetagupox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdf
    • https://cdn.shopify.com/s/files/1/0439/1092/2392/files/merulavafivawaposas.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_off00009d7e.bin
8ae9763290b0792d6fc699432e934b9e193e1863676434fbefd2cdd6de4bafd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7E 4756 bytes
font_01_sfnt_off0000ae71.bin
52b5441d286ce30144f11b07f8efa96d6d0a463a72d70f82b73ab44036dc30ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE71 5088 bytes
font_02_sfnt_off0000bfaf.bin
28a23c91a228d8364cc52fc7cb3ed810abf5b1538464324e886074f44d8ebcac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAF 15464 bytes
font_03_sfnt_off0000f03e.bin
9612c2816831062a1def0a562f4d719caf2f9bdd2b3b752bf39f80bdd5d89cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 17244 bytes

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