Malicious PDF — malware analysis report

Static analysis result for SHA-256 d811d314b6486ba3…

MALICIOUS

PDF

38.8 KB Created: 2020-09-01 01:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd81c87d99e1bcd9bd6928b9ae0b39bb SHA-1: 448a47880644ed84f5a0745a0ddb0d1b190cf243 SHA-256: d811d314b6486ba34ae976aa3c777c02d636e3782c5bec168e35f92ba22c698a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded links, one of which, https://ttraff.com/wix?keyword=genetics+laboratory+manual+answers, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to "Genetics laboratory manual answers". The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. The ML classifier also strongly indicated maliciousness.

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=genetics+laboratory+manual+answers
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/nibawe.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/space_oddity_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/american_billboard_awards_2019_performances.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/restaurant_marketing_strategy_examples.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/54049302947.pdf
    • https://cdn.shopify.com/s/files/1/0441/1555/8552/files/femivira.pdf
    • https://cdn.shopify.com/s/files/1/0433/7804/9189/files/86934850658.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/income_tax_slab_for_financial_year_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0432/9275/4076/files/vuxesebal.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/19779414041.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/august_2018_calendar_word_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/1839307549.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8688/files/79693823263.pdf
    • https://cdn.shopify.com/s/files/1/0440/7309/1222/files/geruzinuvujupawow.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/73108692187.pdf
    • https://static.usrfiles.com/ugd/ea78e0_d35edb63d4dd4e939d036e5fef092130.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd0ce4da3a354f04baf23d742bfe07a9.pdf
    • https://static.usrfiles.com/ugd/111c46_8aceb04ef7e84f62af4d919321eab48a.pdf
    • https://static.usrfiles.com/ugd/0bcf16_7ace52887cb741dd9c8b4ec946ed3303.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ca3.bin
b9fa9fe709fa403bb326d6fbf5952f8acd4402f51e460bdd52c582536cb19178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA3 5192 bytes
font_01_sfnt_off00005e47.bin
18650853a46ded6b0a60b2a6cd9c3be10734e33b7d54214deff337b337f82344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E47 9840 bytes
font_02_sfnt_off00007fa8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA8 4324 bytes

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