Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16324852f9f8cd8…

MALICIOUS

PDF

38.3 KB Created: 2020-08-15 10:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f120a7fd8ee36c1813d1035a1b4f49f1 SHA-1: 9565ea496ad527f959d2da77b25f678dbd09ed3a SHA-256: d16324852f9f8cd822cbfbb678e943d3387d5aa1fc3d22bf83666ffa136a26e0
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating a phishing or scam attempt. The document body text, though garbled, includes keywords related to 'Aptoide apk grand theft auto san andreas', suggesting a lure to download potentially malicious software. The primary malicious IOC is the redirector URL which is designed to lead users to harmful 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.com/pify?keyword=aptoide+apk+grand+theft+auto+san+andreas
    • http://rizugop.connecticutcanines.org/uploads/1/3/1/3/131383791/73535a31e8d6a4.pdf
    • http://files.chefdavidbmorrison.com/uploads/1/3/0/7/130775196/rojisogaji_vaxegodipokarar_reratuvu.pdf
    • http://files.littlecoveliving.net/uploads/1/3/0/9/130968912/kenavi.pdf
    • http://ditojer.pdhcparents.org/uploads/1/3/0/7/130775432/xitifotowunuj.pdf
    • http://kudor.episcopalclaycenter.org/uploads/1/3/0/8/130874058/tusotijujox_bofomaja_muvap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/44388360145.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/auditing_and_assurance_services_a_systematic_approach.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/raduvodonepogutalawesev.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/vovajasikazez.pdf
    • https://cdn.shopify.com/s/files/1/0440/6735/6824/files/xanifesinupuwowi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4654/2229/files/nojivatutadenogi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1128/2840/files/48719103871.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/94351534401.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057e3.bin
db5b538c8373b63e1919f752e96973c45c3750f0cf2c7f5622c96d1af78de77a
pdf-font-stream PDF embedded font (sfnt) at offset 0x57E3 5324 bytes
font_01_sfnt_off000069fa.bin
b6aa1c3146ccae6bae85b6941543f69f7b70d26170e20508d1e2453578ee7a16
pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 10448 bytes