Malicious PDF — malware analysis report

Static analysis result for SHA-256 68627a4b351dcef8…

MALICIOUS

PDF

50.5 KB Created: 2020-08-05 04:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff2ac86146792d20c60cd178b83392b4 SHA-1: 5f1845d39fe30d480333d27e261b66e8e9bd160e SHA-256: 68627a4b351dcef8c4294875f988f162cbf55bedfa8a0d5969abab474e902e43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'sheet metal gauge conversion chart'. The presence of a link farm and a high ML classifier score indicate malicious intent, likely to redirect users to malicious sites for phishing or malware delivery.

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=sheet+metal+gauge+conversion+chart+pdf
    • http://files.ohioheartgroup.com/uploads/1/3/0/7/130775387/82bb7f8a6.pdf
    • http://files.truemusicco.com/uploads/1/3/2/3/132303261/3207179.pdf
    • http://files.valleypetservices.net/uploads/1/3/1/8/131856129/sofabigefunimap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/58662494412.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/fozixukibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8718/3515/files/muboxad.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/8ball_mjg_living_legends.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/avast_free_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9832/3609/files/sifidomimarogota.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/electric_circuits_10th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/selino.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/41530890161.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/66354547004.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.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_off00007c86.bin
aa2fe8546f49e043f5d0eee0225fd17c2cccc34b8fbfaf08454f8883220ef62b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C86 5732 bytes
font_01_sfnt_off00008fe6.bin
2e67dcefdb3ac2ee13bd33124935fdd64bdc47845eb7c12755290eebcf49979b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE6 14356 bytes