Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c688ea32c92c534…

MALICIOUS

PDF

43.3 KB Created: 2020-08-06 17:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa6065d7c694ff0d347e02b9ae0654b SHA-1: 31245b98d5d2a29567e03ae3e2c98d862bfcc3f2 SHA-256: 3c688ea32c92c534b282da70eff852871db505bf9b40a06e2ef38e6ea9f738a1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external sites, indicating a link farm. One critical heuristic identified a redirector link to 'ttraff.cc', suggesting a malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and several other Shopify-hosted PDF links, reinforcing the link farm and redirection attack pattern.

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=modal+auxiliary+verbs+exercises+with+answers+pdf
    • http://files.prettybauble.com/uploads/1/3/0/7/130738993/lusup_dawez_sowubobodo_zonulaxoduniti.pdf
    • http://files.tucsonderbybrats.com/uploads/1/3/0/8/130814856/1373540.pdf
    • http://files.lisamariamadera.com/uploads/1/3/1/0/131071240/8241466.pdf
    • http://files.blackpeakstudio.com/uploads/1/3/0/9/130969115/fupexafetog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/zopeweboko.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/mevexatuvomujanatowuxabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/o_level_biology_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/77638951555.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/tewarebaneziwamufojenub.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/keliba.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6840/files/gezapomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/wefedabedigikuvejaru.pdf
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/81702910918.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6396/files/4076832136.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/vowaxemiwamafowozitoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/6538/4861/files/41716451010.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_off0000549e.bin
7528d4182d5b7d4f1277b371a88d9e611379e65035e627d2adc1b4df708bf31c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549E 5712 bytes
font_01_sfnt_off00006831.bin
69884c30b9ebe3b4ba09c46a218992097269958144e5a4b01624b39a3ca65651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6831 10060 bytes
font_02_sfnt_off00008ae7.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE7 16060 bytes

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