Malicious PDF — malware analysis report

Static analysis result for SHA-256 78be41cba81705a4…

MALICIOUS

PDF

63.6 KB Created: 2020-08-08 05:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51ac39f384a1a634ecab48f6902edcc7 SHA-1: f08a27c885d893ef822f10f427b40aa8a42aa49f SHA-256: 78be41cba81705a4a718f782f76b19ebfc62caaa01df3b06b4f3100cb0a83f05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'explosion box template pdf' and includes the malicious URL. This suggests an attempt to lure users to malicious sites, likely for further exploitation or phishing. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious 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.cc/pify?keyword=explosion+box+template+pdf
    • http://files.tateliberaswanson.com/uploads/1/3/1/3/131383255/kugifipikawam.pdf
    • http://files.rileytechnical.com/uploads/1/3/0/7/130738876/japofigagife.pdf
    • http://files.jabberboxing.com/uploads/1/3/0/7/130776852/pakezogufevuser-kadusovezulativ.pdf
    • http://files.stjohnlutheranchurch.com/uploads/1/3/2/6/132682655/xojuwejuvexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/65514590257.pdf
    • https://cdn.shopify.com/s/files/1/0428/9927/5935/files/piwurunugemusefamab.pdf
    • https://cdn.shopify.com/s/files/1/0428/7863/2095/files/budget_deficit_and_economic_growth_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/magur.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/judixowibezin.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/arduino_beginner_kit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/jixasukizux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2338/4219/files/farsi_letters.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6074/files/segadamajaxibos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8784/files/24870399682.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/guvowoxuwomafazuloki.pdf
    • https://cdn.shopify.com/s/files/1/0437/3472/8853/files/ggplot_change_axis_labels.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_off000069f6.bin
ad642610238166bea2eedff2fbefb74833311dd18e236a8f9ae9ae192801afd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F6 20292 bytes
font_01_sfnt_off0000aa12.bin
f81c90479c3fe930bee46a0f6e9295409dbf5aef1df1866bfe162f1bfa6379ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA12 5256 bytes
font_02_sfnt_off0000bbe1.bin
3ae6ebf78d7feaec23e67f0e63b5f49c3ff6df44bbdca68e0fb8945fa6603bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 17408 bytes

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