Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ff61c871d589fa…

MALICIOUS

PDF

47.4 KB Created: 2020-08-10 07:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecfed5894a8ae9ea6c8b86c3b1d58c34 SHA-1: 6de64671d1802dd89b2b9af01cd122f83ba08a85 SHA-256: 54ff61c871d589fa54b386754d000e15e0fd4205375494a544ed70b9e92126fd
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document title. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack. The document body itself is heavily obfuscated and contains embedded URLs that appear to be part of a link farm.

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=developing+emotional+intelligence+in+the+workplace+pdf
    • http://files.threediamondscbd.com/uploads/1/3/0/7/130740092/371a2ba1b9.pdf
    • http://tezibelol.bettereatingcoach.com/uploads/1/3/1/3/131379246/fopova.pdf
    • http://files.marshalltownmainstreet.org/uploads/1/3/1/8/131858045/jadidavumakafu.pdf
    • http://files.kanzikiberafriends.org/uploads/1/3/1/4/131452876/227813.pdf
    • http://guximopi.thetippinteacup.com/uploads/1/3/1/8/131872269/wijen.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/11764326077.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/pukerukis.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/cetoconazol_creme_sobral_bula.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/33256125381.pdf
    • https://cdn.shopify.com/s/files/1/0437/4455/9258/files/viduwapejubujawerofapiwef.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/inhibidores_de_angiotensina_ii.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/economic_growth_david_weil.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5134/files/bivoju.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/bored_pile_design_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2457/files/jiponori.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/vobosarugufovinijeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0499/files/89910655810.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/mario_party_3_wad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.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_off000079e0.bin
7bb9706f3c8765a2d62a4894cd111ba584a34792077ae54f8362285f39adc789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E0 5604 bytes
font_01_sfnt_off00008ce5.bin
5b12d5d2e336ca3e21a14f71a4cb5b21cc3d66022dd9d1bde6412600c866f150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE5 10296 bytes

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