Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2e6c00c1fd32a2…

MALICIOUS

PDF

53.6 KB Created: 2020-08-25 21:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf6f3e44eb61eacf6296a946c15fe7b SHA-1: 73adf272a4dda8d2a888ec2dcfe2d0856473f2bd SHA-256: 9b2e6c00c1fd32a25177a75bfe8fafff83e3bef20485888bf76873fc63037ab0
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body also contains the URL 'https://ttraff.com/pify?keyword=dns+server+clash+of+clans', which is likely the initial lure. The file also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains, though one specific link is flagged as malicious. No scripts were extracted from this sample.

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=dns+server+clash+of+clans
    • http://files.ndfresearch.com/uploads/1/3/2/7/132740930/5415914.pdf
    • https://cdn.shopify.com/s/files/1/0439/0505/6920/files/standard_fitted_cot_sheet_size_australia.pdf
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/pufafut.pdf
    • https://cdn.shopify.com/s/files/1/0438/4335/4781/files/october_2020_calendar_kalnirnay.pdf
    • https://cdn.shopify.com/s/files/1/0434/2120/4631/files/gebisudurepagazefojin.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8817/files/vabam.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/61987620109.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/swagger_mega_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/de_forma_altruista_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0436/1483/0749/files/1020_cold_rolled_steel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/20691360909.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/rinevotofagatepase.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/lepulobemiperiteki.pdf
    • https://cdn.shopify.com/s/files/1/0431/7868/8663/files/41045962814.pdf
    • https://cdn.shopify.com/s/files/1/0437/2175/2731/files/pavetovep.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_off00007d9c.bin
827293f12e209951e7bf46858885cf3f3fa5d7222e832ea1afc86b9f8d7d192d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9C 5028 bytes
font_01_sfnt_off00008eb3.bin
c11edcbbbbebe426e273e36e16a11f5814bef9f4fe005fec071b1f1d1152ec23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB3 10588 bytes
font_02_sfnt_off0000b2dc.bin
57ad889fdfdca6138e66613e51573b879bded88e2cb93453e94f54cd2d2ab675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 16972 bytes

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