Malicious PDF — malware analysis report

Static analysis result for SHA-256 be21d2f006d4b9aa…

MALICIOUS

PDF

57.4 KB Created: 2020-08-19 23:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1856cce3b5a40a61d0b49c8918766ad SHA-1: 0df7bb1d4f08e6a1e225d5d937d40296d87b6271 SHA-256: be21d2f006d4b9aa4868896fe1bd9174400684ef19c94acf0fa1e10c6bcd3e55
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=itunes+win+10+64+bit'. This URL is likely part of a lure to trick users into downloading software. The document also contains a large number of embedded links, many hosted on Shopify, which is flagged as a PDF link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly suggests a social engineering attack aimed at software download.

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=itunes+win+10+64+bit
    • http://files.hlhas.com/uploads/1/3/1/4/131483550/wuvoxipepuzan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1714/2433/files/domagofesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0402/files/free_download_marathi_kadambari_in_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/omb_a_122_circular.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8059/files/remokonirotojugapagoliger.pdf
    • https://cdn.shopify.com/s/files/1/0438/7527/0811/files/fisiopatologia_del_sindrome_anemico.pdf
    • https://cdn.shopify.com/s/files/1/0450/5042/9598/files/electricity_and_magnetism_purcell_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/28289329203.pdf
    • https://cdn.shopify.com/s/files/1/0440/8596/9048/files/66739568685.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/labemaliwipuvu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dd8.bin
e0f082b9d939e60f36539d46159e66a47cbb241e4df4b0535bbe9b7737dd4856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD8 6656 bytes
font_01_sfnt_off000074ae.bin
426ba19cca718552fda3bf3c0ee95cfa127d859df963ac76148210445328336a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AE 4944 bytes
font_02_sfnt_off000085a6.bin
be38186c9256ba0e64b07d34cca2e63b176d3ffd182ae4667a642b503e748fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A6 6148 bytes
font_03_sfnt_off00009586.bin
d326b7fcd015a6f8525753e4ca50dff4e4899450d206c0c31b7e2a20b947a5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9586 13344 bytes
font_04_sfnt_off0000bfbb.bin
f1068aba40af0ef98c4bb03e21f33d548bfdfdd2813f813e6ab2e9c70ff7eb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBB 16984 bytes

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