Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8dcccaad75232f…

MALICIOUS

PDF

37.2 KB Created: 2020-08-24 19:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51c5be7858e4b31d0ece89a89ed35e77 SHA-1: bf478597724ab89655ada4a01a48949fdfabae87 SHA-256: 6b8dcccaad75232f57ac29a8b0bd67a552248ed34511bb5aeac3217453d01f41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body text, though garbled, includes the same URL, suggesting an attempt to trick users into visiting malicious sites. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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=kaththi+nee+yaaro+song+ringtone
    • http://divuxemo.abctsgmsig.com/uploads/1/3/1/0/131069759/pugumukiresapenixow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/6719910930.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/wovurezosigeravarametopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4032/files/77878086252.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/karugizomobijuparel.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/25183764729.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/86474653632.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/89208119725.pdf
    • https://cdn.shopify.com/s/files/1/0436/4363/3822/files/95195079840.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/denigotib.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/5106986731.pdf
    • https://cdn.shopify.com/s/files/1/0436/1355/2802/files/watibotuwamilofep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/diet_plan_for_flat_stomach_in_2_weeks.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043af.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
pdf-font-stream PDF embedded font (sfnt) at offset 0x43AF 6744 bytes
font_01_sfnt_off00005496.bin
64c9d5350d5e201ad3b94d82a296300473b7585a17ac810810477f81f3b66533
pdf-font-stream PDF embedded font (sfnt) at offset 0x5496 4988 bytes
font_02_sfnt_off0000658d.bin
5527434e5d59b0f7c99fa73ffaae3873f561597bf2e7a6171bc527ebc71f1ce9
pdf-font-stream PDF embedded font (sfnt) at offset 0x658D 10092 bytes