Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c3edc6678ec84c…

MALICIOUS

PDF

34.4 KB Created: 2020-08-02 23:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b9f10713529182c7362f39eb41b92b SHA-1: 95e7cbbb9129a265d4b472fa7f0ab8d06a25b863 SHA-256: 93c3edc6678ec84cdbd787c2838438fd5c3ce6c72ee061021d008a0798fb8594
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, forming a link farm. One of these links points to a known malicious redirector, ttraff.com, which likely serves as a distribution point for further malicious content. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links, many hosted on seemingly compromised or low-reputation domains, suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning techniques.

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=um+4400+125
    • http://files.taymun17.org/uploads/1/3/0/7/130775180/xujiwugadamevevojima.pdf
    • http://files.propello-coaching.com/uploads/1/3/1/3/131380871/xogitoxumub_zimezexuwil_xeximefeforuro_kuzuvesemip.pdf
    • http://files.peterlowden.net/uploads/1/3/1/3/131383720/7294733.pdf
    • http://files.helpabee.org/uploads/1/3/1/4/131437885/pugitibesapaje-zuxixoginol-walazozomuro-bodedowov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/62130126123.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/watof.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/gozuretilawixaruvovuxajor.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/wivuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/bojoxivofofunepudinul.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/fezupijibajodis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/89128008533.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/goviwejesuwepewokigoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/kamotolejofemojopa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/enter_the_gungeon_master_round.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/divelixufepaweridewexorof.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_off00004bee.bin
4e35ab8d2fab2b73f0043107dcc12d3a93747d943041bb25be942dc82be9ef11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BEE 4844 bytes
font_01_sfnt_off00005c73.bin
4b4dd8870f797e79b8c3d4b3de2cca06c731a5a64746e28d33ff2abd63632135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C73 9480 bytes

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