Malicious PDF — malware analysis report

Static analysis result for SHA-256 273a963b344bbd2b…

MALICIOUS

PDF

42.3 KB Created: 2020-08-01 10:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eac48672e0a5b1200b8d57e9a13e73f7 SHA-1: c545243cc1bf9fe6141426ec86760a70240c16e4 SHA-256: 273a963b344bbd2b5586b7636a375d3dddcde72b7e1fb4e41b239533adc1232d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The heuristic PDF_SEO_LINK_FARM also indicates a large number of outbound links, many of which point to potentially malicious or suspicious domains. The ML classifier strongly flagged this PDF as malicious. The document body itself is heavily obfuscated but contains URLs that are consistent with the observed malicious redirector.

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/wb?keyword=konsep%20posyandu%20lansia%20pdf
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdf
    • http://files.thetherapyspacechelmsford.com/uploads/1/3/1/4/131406036/lapimoti.pdf
    • http://files.ourladywillowbrook.com/uploads/1/3/0/9/130969680/7478728.pdf
    • http://files.kellerbassteam.com/uploads/1/3/0/9/130969573/a461e221921.pdf
    • http://files.orlandidancecenter.com/uploads/1/3/2/8/132815388/2a317.pdf
    • https://cdn.shopify.com/s/files/1/0434/3732/6488/files/duzavotinunuwofamiga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/yamaha_outboard_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/1787755188.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9443/files/maryland_state_board_of_cosmetologists.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/fuwelofanuxigipaxer.pdf
    • https://cdn.shopify.com/s/files/1/0432/7456/7843/files/popoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/58075280543.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/zusodagujariwowizufewum.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/polarekij.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_off00005b2f.bin
7ff42eb43a4e9ee5ad1661ed666756b9a2b2f38ad4d9896946d61f3fce93b93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2F 4812 bytes
font_01_sfnt_off00006ba1.bin
d3f24701a58809c9b2c00ae0031131f6055d1436588ecafd8530094285c94ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA1 10180 bytes
font_02_sfnt_off00008e5f.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5F 4324 bytes

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