Malicious PDF — malware analysis report

Static analysis result for SHA-256 77719a867d298d1e…

MALICIOUS

PDF

43.8 KB Created: 2020-08-20 02:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 705d7d2870e72a6d69ebb6b745a375be SHA-1: 718b1bef0d6158b823b1161fb576b651cbe80d26 SHA-256: 77719a867d298d1ea59477b540fdbaabf361be9329181f04dc06086a2d852eef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to this redirector. This suggests the PDF is designed to funnel users to malicious sites, likely for phishing or malware delivery, rather than providing legitimate content.

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.cc/pify?keyword=halfords+bike+helmet+size+guide
    • http://xobawi.jacklechon.com/uploads/1/3/1/3/131381497/7363581.pdf
    • http://tesotebo.kaplanphd.com/uploads/1/3/1/4/131437949/badote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/chemistry_practical_experiments_for_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0428/1047/4663/files/83386170467.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/pneumatic_reciprocating_water_pumping_system.pdf
    • https://cdn.shopify.com/s/files/1/0436/4579/6512/files/keporazegizepeme.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8997/files/love_stage_ep_1_eng_sub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7178/9469/files/ccna_security_dumps_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/stp_plush_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/topoka.pdf
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/barking_up_the_wrong_tree_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/busutazemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/marvin_harris_el_materialismo_cultural.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/22427865048.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/favomapovuzizifutofozer.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_off00006bb4.bin
d37eb62d6b29e7053e6afd0cff5d87cec2d245828032ef55cb4b3ace9739e67b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB4 5536 bytes
font_01_sfnt_off00007e61.bin
0b0c89a541a21d897acef9295a9bb559ef5200ecf100807e35d17774b36c0ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E61 10512 bytes