Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70277dd7fd5cabe…

MALICIOUS

PDF

42.6 KB Created: 2020-09-02 06:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f160a0fd7f8f1b7023c7198b19c08d8c SHA-1: d3e6f9762f34dbc04cad1d23197998f01d749cae SHA-256: a70277dd7fd5cabe87e296ef57e8966afb8e5d727b4b2c0a24a0437853558ba8
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to Excel spreadsheets and the malicious URL. The presence of numerous links to external PDFs suggests a link farm or SEO manipulation tactic, potentially leading to further 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.com/wix?keyword=excel+spreadsheet+sort+greyed+out
    • https://static.usrfiles.com/ugd/b7306e_455fbd9c8d574b059aa1c9870364ed77.pdf
    • https://static.usrfiles.com/ugd/e33828_05bfe7581c074ca9a42ff5bc632d3956.pdf
    • https://static.usrfiles.com/ugd/4b7290_d9e353d32c5d4fcfb39484c389b53492.pdf
    • https://static.usrfiles.com/ugd/b8c837_84e7eea281714fa3a1c0a06a05a3401c.pdf
    • https://static.usrfiles.com/ugd/a0905b_7675b1d65dd7411fb3a2bcbe92af0be6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d76afc95570843bbb83e292015836584.pdf
    • https://static.usrfiles.com/ugd/85d67f_77252f8586b74ff6880aa11bba0aee3a.pdf
    • https://static.usrfiles.com/ugd/22bf55_494255afaa1744028de9c4786179c2bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_784ab9ff4f1f49e38983d04f34a910e7.pdf
    • https://static.usrfiles.com/ugd/145364_6410f83623744c148246602c85ee47b3.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/tenatuvimefej.pdf
    • https://cdn.shopify.com/s/files/1/0446/7779/1897/files/da_5913.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/lasoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dazekenikajupupapunel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/honda_gcv160_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1de1c023a5a4ace8c1d74a72eafdd2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9616aa18dc914bb6bb01111b6d486959.pdf
    • https://static.usrfiles.com/ugd/b6edda_ade12db9718f440c82abf783ae3cec35.pdf
    • https://static.usrfiles.com/ugd/70c1f8_ee53a7b3ebfe40a3a807e37274faf3b8.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_off00006590.bin
1a227f3fd93648baf47af31fa1f6e87d49f78ccab41b17f6ed70e4da257d2c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6590 5460 bytes
font_01_sfnt_off0000782b.bin
37b9d58eb50854524a8025033905a0ee2725a0eb466a6c48e59aac100b7f8120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782B 11152 bytes

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