Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdf5499ed5335bc…

MALICIOUS

PDF

45.2 KB Created: 2020-07-31 13:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0577e39dac41e308629551ebe9e61c SHA-1: 2d0ae9d1136386850ef4b051f6cc8d084421f5d0 SHA-256: fbdf5499ed5335bc05d590577f5ac78c7563726f5fe413c3cfebabae78cd892b
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, which is indicative of a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the ultimate destination for malicious activity. The document body, though heavily obfuscated, contains text related to PDF conversion, suggesting a lure to entice users to click the malicious link.

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=pdf+to+word+converter+using+nitro
    • http://files.jehzanexclusive.com/uploads/1/3/0/7/130776158/2ea89249d24d59d.pdf
    • http://files.harrylahrauctions.com/uploads/1/3/0/7/130776809/bowanabenup.pdf
    • http://files.krakenemporium.com/uploads/1/3/1/4/131406849/jetamigexub.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/98033250617.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/bugoforeni.pdf
    • https://cdn.shopify.com/s/files/1/0428/1552/0935/files/71939890161.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/96373005886.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/90643787779.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/dujawasupuzegetubelej.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8454/files/jigejukimomolagufez.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/faxizowuvurafekaxukiverox.pdf
    • https://cdn.shopify.com/s/files/1/0428/6929/3223/files/wojeziratejuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/83815711728.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/tetiminuxokigoxorimasebit.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1954/files/bipakebiwilapigosinit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/58504077136.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073c9.bin
899074346edaf9513445fce013e8a715e7a25bc7aae01ed1b5077972ca65ce1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C9 4980 bytes
font_01_sfnt_off000084dd.bin
024d226260e54e33ab218d3ef3bf57aa66b8355faa865548900e61a28c08cc37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DD 10228 bytes

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