Malicious PDF — malware analysis report

Static analysis result for SHA-256 83217c5ffe431588…

MALICIOUS

PDF

40.7 KB Created: 2020-08-23 04:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 620fe7b2f55fdfca60f02656af5eda6b SHA-1: 646a925c00c562f65b2d07d1cf30bba2b5b7fe1f SHA-256: 83217c5ffe4315888f8c1385ae232558b51ca29e1f3f19621583a4b713d71bbf
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous external PDF files, with one link pointing to a known malicious redirector. This suggests an attempt to lure users to malicious infrastructure, potentially for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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=7th+sense+movie+songs++sensongs
    • http://files.levelupchurchmemphis.com/uploads/1/3/0/7/130740249/8916075.pdf
    • http://files.all4pawsdogrescue.com.au/uploads/1/3/1/4/131455883/9425829.pdf
    • http://gomoka.katieargyle.com/uploads/1/3/0/7/130775403/79cd5e87f.pdf
    • http://files.hardemanschool.com/uploads/1/3/0/7/130775528/toborofajipoji_nupigovi_dakaxo_mowekeruse.pdf
    • http://galeza.powerofmath.net/uploads/1/3/1/3/131379478/2050617.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/lopodivegufemuniva.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/mufari.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/90024644284.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0430/1189/9545/files/13053992213.pdf
    • https://cdn.shopify.com/s/files/1/0445/7719/4148/files/discord_css_text.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/xaposuzomoliroferirisop.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/32730463088.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/botanical_names_of_plants_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/race_condition_in_java.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_off0000596f.bin
abef1aab1adb3a0e2547917965d34ce4d338a16e1f199ebe9a6061411746e44e
pdf-font-stream PDF embedded font (sfnt) at offset 0x596F 4804 bytes
font_01_sfnt_off000069b4.bin
50043d0c16ce7a1c7e50c74644d2c409537d35bedbe3d30335300c36f621af24
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B4 13992 bytes