Malicious PDF — malware analysis report

Static analysis result for SHA-256 633621aa622bf8c6…

MALICIOUS

PDF

49.4 KB Created: 2020-08-23 12:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 192bd343be3427c90825cd6e1e19d75c SHA-1: 2b6ada4b7aa0b186b87dfa36dbcaabfc1cb25329 SHA-256: 633621aa622bf8c60589e2ddeeddde9dc9215aae1778784d4944fafd1c2d58b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection chain. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely spearphishing attachment, leading users to click on the malicious link.

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/pify?keyword=kumano+kodo+self+guided+walk
    • http://supiwon.the-nature-atelier.com/uploads/1/3/2/6/132682974/takotobabi.pdf
    • http://files.face2facewithhorses.com/uploads/1/3/1/3/131379540/2855727.pdf
    • http://files.showbizsosyal.com/uploads/1/3/1/3/131398184/nejozana-vabikukojalevo-netidenavazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8439/9270/files/77204926272.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/bollywood_movies_2019_free_3gp.pdf
    • https://cdn.shopify.com/s/files/1/0433/5396/4712/files/belimo_damper_actuator_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6234/files/janatha_garage_telugu_movie_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/69695016908.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/bhu_bsc_entrance_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/98266009226.pdf
    • https://cdn.shopify.com/s/files/1/0457/5130/4348/files/volapomosorofonopijuwuxod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3442/files/the_accountant_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/39536265076.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/vimikugifaliru.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008002.bin
507cfdf617cb72f3645123a27a337e467ff1890e1301552889a413c5971918f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8002 5256 bytes
font_01_sfnt_off000091e4.bin
0c9ad0011034f83a29a3f71c341c5b0f6d45b26598af6fcb871708619f176a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x91E4 12156 bytes