Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9ba8c2769b3108…

MALICIOUS

PDF

74.2 KB Created: 2020-08-23 21:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c01a23abdd43b494624d1949579d1566 SHA-1: c899def14749b8803daff1a3b1ab2ade3f8d18ba SHA-256: 0b9ba8c2769b3108aa9a703725577d9de94fd47918d5f3d99b822fb10fd1b776
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a manual for a Mercedes C180, likely a lure to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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=mercedes+c180+avantgarde+2015+manual
    • http://files.sounomazzi.com/uploads/1/3/1/3/131398177/kaboj.pdf
    • http://lulamofob.tencommandments4life.com/uploads/1/3/0/9/130969352/nasanevokuwupis.pdf
    • http://dumolu.fbclakebenton.org/uploads/1/3/1/4/131407406/9497713.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6339/1894/files/rebukogapeta.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8773/files/givaxapobirodare.pdf
    • https://cdn.shopify.com/s/files/1/0438/3267/2418/files/plural_possessive_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/37939062597.pdf
    • https://cdn.shopify.com/s/files/1/0447/3536/5276/files/breastfeeding_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/non_resident_capital_gains_tax_form_uk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/wexaxidara.pdf
    • https://cdn.shopify.com/s/files/1/0429/4223/4791/files/castrol_oil_capacity_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5988/files/fiverr_basic_english_test_answers_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/fepazanuwu.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_off0000e577.bin
8fd762fdce2196ddb8e1eb51360c32db33bc44d27c50f627b7b80490cc09c984
pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 5968 bytes
font_01_sfnt_off0000f9c6.bin
ba3b89adfdb717185d44fc6a1d33532c7e2133fa2d79e591421e64f75c5cd8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 9772 bytes