Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f17358d2dca64a1…

MALICIOUS

PDF

68.2 KB Created: 2020-08-05 22:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: effa9b507af42c3f6e622e32ed007537 SHA-1: 2d079810832ebeb47bfb2b84d969c351226436b5 SHA-256: 9f17358d2dca64a1f1616cfea0a2547336a32d6ddab0ef5928c0221618f55fc8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=hp%202101nw%20wireless%20g%20usb%20print%20server%20manual'. This URL is embedded within the document body, suggesting a social engineering lure to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. The presence of a large number of external links, many hosted on Shopify, indicates a potential link farm for SEO poisoning or distributing malicious content.

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/wb?keyword=hp%202101nw%20wireless%20g%20usb%20print%20server%20manual
    • http://files.islandhillfarm.ca/uploads/1/3/1/0/131070367/5972948.pdf
    • http://xisipavun.norikohanamassageacademy.com/uploads/1/3/1/3/131379312/falosol_nojisijibime_davoliza_jeris.pdf
    • http://files.paintingsbyjacquelinekottwolle.com/uploads/1/3/0/8/130813736/181047ff.pdf
    • http://files.shackboldon.com/uploads/1/3/1/0/131069879/gomito.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/buluromelanusef.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/bodegirugojofiwijos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9815/files/gegekitawizidijaraviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/80149943400.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/kigagifedafavinovegulasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/tudiwigaselibakupomana.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/zixagunigewododunored.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/firudupavala.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/past_simple_questions_exercises_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/65949870098.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_off0000bdb9.bin
c25fabce537e6cd4510d72dcbe6e01484f5ffdbfdcca8a4cbb15ada1ac6d95af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB9 5716 bytes
font_01_sfnt_off0000d13b.bin
7e7ddcffdab71487ffbecdee092b8ee735a4b2f5480fee7a4edd06a75c77e588		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 16224 bytes

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