Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a817d6872cb6bb…

MALICIOUS

PDF

65.6 KB Created: 2020-09-01 01:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b535b75be4f2826acf100f3e6772ae SHA-1: aca71b2c4dd71f686381c43b0ef8fb44afe20837 SHA-256: a7a817d6872cb6bb328bdaba556fdc094e20bc6e2f63b52fb59c80d9ada28f91
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). This suggests a phishing or redirection attack. The document body, though heavily obfuscated, contains the same malicious URL and references a PDF topic, likely as a lure. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=asmaul+husna+in+malayalam+pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/reliability_in_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xajubebajodefemun.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/91104517213.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5833/files/nagebopajilinadexe.pdf
    • https://static.usrfiles.com/ugd/b6edda_86571fdda0424efd899ebb37cb25ee4b.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_5db78c8dbb7e4a92b0fe667e671f62d9.pdf
    • https://static.usrfiles.com/ugd/4c76bf_63627c4a52ee49258987b6dc9455b398.pdf
    • https://static.usrfiles.com/ugd/9e53d4_340f5d557c5e4778aa62c68d3db9612e.pdf
    • https://cdn.shopify.com/s/files/1/0462/6451/6757/files/4028284990.pdf
    • https://cdn.shopify.com/s/files/1/0447/1944/0028/files/une_bonne_hygine_de_vie.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/bayreuther_festspiele_2020_spielplan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/cambridge_english_advanced_3_student_s_book_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/98679338484.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/eclipselink_in_eclipse.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
stream_007_off0000c571.bin
42376c6b90e8f58bdc6cca2dfc071dc1d7d049af66cde75d5151e935249aa780		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC571 28960 bytes
font_00_sfnt_off00006f87.bin
fdf53e69fd6d27ee006aa883fb4c702e2c53c81ab3456ed34f667bf41344363a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F87 5276 bytes
font_01_sfnt_off00008154.bin
abde37dcd6855e33b25b630360108437a4ba7fce9a653763ddd24247be1c2c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8154 9108 bytes
font_02_sfnt_off0000a064.bin
36c76de7b9582d5bdddc14a3cdd28d1981c9a9f94acba94412bd055a2f3fc45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA064 10928 bytes

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