Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d1e6e4406c7c5e…

MALICIOUS

PDF

42.8 KB Created: 2020-08-03 13:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a1f5128010489a8c1e79c6e3c3755b SHA-1: 215d81326f5a5866676f875fa86054d1ffabf1be SHA-256: 82d1e6e4406c7c5e4d494ab4126c5ef67fad0b4a74b97dd8a8c2ceaa1a96223f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to appear as free study materials, but the primary link redirects to a known malicious infrastructure. This suggests a phishing or scam attempt to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

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=biblias+de+estudio+gratis+en+pdf
    • http://files.sharomshorthorns.com/uploads/1/3/1/3/131384602/6539809.pdf
    • http://files.c3edu.org/uploads/1/3/2/6/132681725/0d441893551989.pdf
    • http://files.infiniteecoclean.com/uploads/1/3/1/4/131407552/mewerekot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/0724/4450/files/sikiwoxizaje.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1810/files/fovilano.pdf
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/what_is_sph_slang.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/63547654970.pdf
    • https://cdn.shopify.com/s/files/1/0439/4106/8958/files/mercury_classic_50_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/50421743243.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8623/files/westlaw_form_builder.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/93080944519.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/58197427170.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/xutivesatogavodijuboju.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/68906349803.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/26533391401.pdf
    • https://cdn.shopify.com/s/files/1/0440/6312/9765/files/zenediv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1371/7662/files/judekepobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/zejanamudiwawolajale.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_off0000581f.bin
8aeab93316e5a5b7ef9f0230db09ad516f9d72963909b68dbcce98fca5247a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x581F 5280 bytes
font_01_sfnt_off00006a0e.bin
a62bf9dc9cf4f1f41b92aff371a0d756132006347cd695047c86adade2f5824e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0E 10972 bytes
font_02_sfnt_off00008dec.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEC 4324 bytes

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