Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1b74f69729ea62…

MALICIOUS

PDF

43.7 KB Created: 2020-07-19 13:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 098f457dbb8e05ef9691fe0693d6d398 SHA-1: da8eed5714b042e1924807670baac22dd3d4d627 SHA-256: 5a1b74f69729ea6261265798bbcfceba5adfe5964b499be8e1b506a9d811d026
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a link farm. One of these links, 'https://ttraff.cc/pify?keyword=literal+equations+worksheet+%25231+answers', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and does not provide clear textual lures.

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=literal+equations+worksheet+%25231+answers
    • http://files.pendapat-malaysia.org/uploads/1/3/1/8/131856827/1294950.pdf
    • http://files.goldensandsresort.ca/uploads/1/3/1/4/131438583/dajulufipakemer-jomedejufivuboz.pdf
    • http://files.rootswellness.net/uploads/1/3/1/4/131437276/8763726.pdf
    • http://files.withagrainofrye.com/uploads/1/3/1/4/131454304/383148c902c7.pdf
    • http://files.gold
    • https://jipikufe.files.wordpress.com/2020/06/90621518781.pdf
    • https://bolivuxane.files.wordpress.com/2020/06/suvalom.pdf
    • https://gipumagu.files.wordpress.com/2020/07/19818701655.pdf
    • https://siwisikem.files.wordpress.com/2020/07/sunodulorubedudojip.pdf
    • https://pamifanasote.files.wordpress.com/2020/06/motosebitotabugirinur.pdf
    • https://duvumis.files.wordpress.com/2020/07/91196773448.pdf
    • https://lemupod.files.wordpress.com/2020/07/kudovadedozawu.pdf
    • https://dejoxiritejo.files.wordpress.com/2020/07/wirofosofexatasedotodave.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0954/files/4287424776.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/37693014018.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/32593018690.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/mopusowuzaloku.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/wepexitorosif.pdf
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/tisow.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6799/files/xowosalupu.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_off00006fb7.bin
45979e08d5ded5c359e8f46987d0805c0329aa72e7beda2d9409514cda110653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB7 4876 bytes
font_01_sfnt_off00008054.bin
b57f38340fa330232041f82b3910e12d5a42f12fca4bede6cc85cc88a7e98c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8054 9724 bytes

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