Malicious PDF — malware analysis report

Static analysis result for SHA-256 8befa10bf1a62ef4…

MALICIOUS

PDF

46.6 KB Created: 2020-08-03 13:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf58a4c06b04197f705d1c050ea8a3b SHA-1: e4679e3c2f05b3a6c54f7c8f080c2fcbfa1cc8e8 SHA-256: 8befa10bf1a62ef49e958c57347e12260b3e51eec6a12452dd2628373c565060
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 of which point to Shopify domains hosting other PDFs, creating a link farm. One critical heuristic identified a direct link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body text, though partially corrupted, contains keywords related to manga PDFs and the malicious URL, 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=berserk+manga+pdf+mega
    • http://files.enlightensurf.com/uploads/1/3/0/9/130969791/xogamur.pdf
    • http://files.osea101.org/uploads/1/3/1/6/131606453/wugapigofone_xoduwofeviw.pdf
    • http://files.youthkings.net/uploads/1/3/0/8/130813095/silexol-loxifofip-piwikavi-wovew.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9162/files/vivuxutopomapupiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/wugoxebodepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/deep_stalker_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/61952446130.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/98934664826.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/jitoloperu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/40370994625.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/79004570974.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/wofomakevazuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2076/2783/files/tepulexalajiti.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/buvezegonuxuko.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/23509444157.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/zitemofonoxizuboj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/sosipigepedafa.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_off00005e13.bin
2c39ba806ddbd8ed5ad6dabfc1fc23fa6c1aafee2ff6351cf2866494fcee68bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E13 3280 bytes
font_01_sfnt_off000069cc.bin
89b20cf3e0f6d732d3e90ec7808aab23d4ac27239544b2084304f44c7094c7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CC 4992 bytes
font_02_sfnt_off00007a9d.bin
9d6b170d92aef78db215f1fbc9fbb0ef85b879dcbf0311a83b80e52de837a60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9D 10220 bytes
font_03_sfnt_off00009d66.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D66 4324 bytes

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