Malicious PDF — malware analysis report

Static analysis result for SHA-256 48305c24e1a7226d…

MALICIOUS

PDF

54.4 KB Created: 2020-08-07 22:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15f40a135821560d60e9421527f4d70e SHA-1: b22d41c6ef65bf7037d7f313b4ff2aba9598fca1 SHA-256: 48305c24e1a7226d7befabf08055caa5d6f7ff4e3096392a81d0ec0377c7b99a
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the malicious URL and appears to be a lure related to 'anemias hemoliticas congenitas pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK strongly indicates malicious intent, likely to lead the user to a phishing or malware distribution site. No scripts were extracted, but the primary attack vector is the malicious redirection.

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.ru/pify?keyword=anemias+hemoliticas+congenitas+pdf
    • http://nebazi.douglasumcmn.com/uploads/1/3/1/4/131438641/jefafip-pikizenez-mamaf.pdf
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdf
    • http://files.episcopalchurchonedisto.org/uploads/1/3/0/7/130739895/julusetiliwejo-nevadutijumud-niwikulobefeni-zupebewunesir.pdf
    • http://files.scriptsupervisingmadeeasy.com/uploads/1/3/1/6/131606537/1736332a15.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/83274591187.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/bruner_theory_of_instruction.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/guxewevorezilevegepamesid.pdf
    • https://cdn.shopify.com/s/files/1/0429/4646/1855/files/tarirelovonubite.pdf
    • https://cdn.shopify.com/s/files/1/0433/7149/5574/files/tutorial_corel_draw_x5_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0441/4350/9656/files/welcome_to_my_mine_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/36963746559.pdf
    • https://cdn.shopify.com/s/files/1/0434/7170/0120/files/52630048993.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4840/files/tamerunag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89089693040.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/3478443236.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/jerawi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a2b.bin
36ebc08393330bd63fa733e5872fefdf38a1cbbfe9b6eff815a0ceea7ccbfbe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2B 5252 bytes
font_01_sfnt_off00009bdb.bin
b1b2adbe9b2664f5dfc09af892322e3014dbb55296665808e1afbe574894bb1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDB 10208 bytes
font_02_sfnt_off0000becf.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBECF 4324 bytes

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