Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2c5a8bdad36c57…

MALICIOUS

PDF

48.7 KB Created: 2020-09-07 15:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33eb5aec27d1bb2512179ced8c331c0e SHA-1: d0fce83e47f251800ae6214146af018a09ea055d SHA-256: fc2c5a8bdad36c57c4b3a13db91674532191b4cdf10fee504c772259b7e3b521
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics as a malicious redirector. This suggests the document's primary purpose is to redirect the user to a malicious site, likely for further exploitation or phishing.

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.link/wix?keyword=install+burmese+font+android
    • http://cinurl.com
    • https://cdn.shopify.com/s/files/1/0469/0522/9474/files/chandigarh_police_verification_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7673/files/6006211225.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/cariotipo_tecnica.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6705/files/kujugenox.pdf
    • https://cdn.shopify.com/s/files/1/0436/6581/7753/files/8515122866.pdf
    • https://static.usrfiles.com/ugd/89441e_6f49bb7273e9429f820ca22b3180a655.pdf
    • https://static.usrfiles.com/ugd/80c1db_d01c18bb307249ab9d98b2bffb0c0ab1.pdf
    • https://static.usrfiles.com/ugd/b8c837_77221a66c268461892ee2ec5bfdc527b.pdf
    • https://static.usrfiles.com/ugd/3e9e83_512619adb2334d35b2334b1cf53c4678.pdf
    • https://static.usrfiles.com/ugd/d4da64_5928331cf1054828af09a1221775fc0f.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4229/files/taxora.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/cause_and_effect_essay_writing.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/71421089986.pdf
    • https://cdn.shopify.com/s/files/1/0433/4567/4389/files/pideru.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/guideline_dm_2019_thai.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_off0000816e.bin
80ef573fa2afda39f7ce577455269c48eceb9a750b06f4542a0c09c8514144b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x816E 5132 bytes
font_01_sfnt_off000092c7.bin
a8571065ea9b2da5fad43cae92c2f37d5ea4a80618f548f17d367148fba4a95c
pdf-font-stream PDF embedded font (sfnt) at offset 0x92C7 10224 bytes