Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f4605eadfb47c3…

MALICIOUS

PDF

50.1 KB Created: 2020-08-31 17:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d518e68ec144794a990faa875e789bf2 SHA-1: ef2312bd21f533353e969f8951f2e7d43b58f9e1 SHA-256: 73f4605eadfb47c3a329cfd28b76dacbb7a0e983c3032528752a92babf18b82c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet with answers, a common lure for phishing or scam campaigns. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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/wix?keyword=small+kitchen+appliances+video+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c1108c_a882019ffb084d81a75566c665fb2833.pdf
    • https://static.usrfiles.com/ugd/d775a9_8366e43a17d24951b32c2e95d27dd46e.pdf
    • https://static.usrfiles.com/ugd/cf79db_8ea1ed0b45154f379fa0765c40d01d15.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_2408ce6b6d3543e2aa7ff2da0e73d2dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e261fc6a85604b87890c33fb52107b63.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/algebra_2_common_core_mcgraw_hill.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/dilejokeripasukazosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/bloomington_2010_hd.pdf
    • https://cdn.shopify.com/s/files/1/0465/3409/9094/files/3595131600.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/puvavibirefuk.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_off00007aa7.bin
c4211aefd170876f56af51ee57a2551c149cc998b9c27542d69ddbbbc5c16db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 5632 bytes
font_01_sfnt_off00008db5.bin
86baedb2dd7d9d4d53ff2714397aec59bea03c7dd17aed7f90da6a78a115c232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB5 14628 bytes

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