Malicious PDF — malware analysis report

Static analysis result for SHA-256 6498b91052b26bf2…

MALICIOUS

PDF

46.1 KB Created: 2020-08-20 23:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 247d2d81e4580dc6414cba70e450703e SHA-1: fb6b778f00096c1dd8cb2ff2402158e20bea85de SHA-256: 6498b91052b26bf2150348aa71e995e78fe3dac31a4d85a74becf93190107aa7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'inventory costing methods' and the tool 'wkhtmltopdf', suggesting a lure to disguise malicious links. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicates an attempt to lead users to harmful 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.com/pify?keyword=inventory+costing+methods+pdf
    • http://files.vytru.com/uploads/1/3/1/6/131606060/5706210.pdf
    • http://mubesej.joaogouveia.co.uk/uploads/1/3/1/4/131409090/belitoruguro-vexemeva-joziwofol.pdf
    • http://bixexime.marieandcharlie.com/uploads/1/3/0/7/130776068/pijuxewegutamafe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/anjali_anjali_pushpanjali_instrumental_song.pdf
    • https://cdn.shopify.com/s/files/1/0436/5955/9065/files/21081255963.pdf
    • https://cdn.shopify.com/s/files/1/0437/5665/0650/files/jabolisepaziwikiten.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4882/files/26502873957.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3521/files/86236235579.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/30096593880.pdf
    • https://cdn.shopify.com/s/files/1/0434/5557/8273/files/23384156428.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6773/files/relekadusajubujilariju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62386903812.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006901.bin
bd881d789d4d57ab641d4600d467ef1fe2a9bd324c116fe5e032f561a21dc61a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6901 5212 bytes
font_01_sfnt_off00007aa0.bin
edf8c6e1bc1c02d0670a78e6872d0e47567253b8ce45d188c6a4ca8890007aac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA0 10404 bytes
font_02_sfnt_off00009da7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA7 4324 bytes