Malicious PDF — malware analysis report

Static analysis result for SHA-256 491fa2d339cb1a6b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 16:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1443a4c95d8109dfb387d242997501ed SHA-1: 5db5e39af85cd8d0b1393e450036113e768107d8 SHA-256: 491fa2d339cb1a6b0f3dc921d53d668ca983f2d5b7cf0c01764570f8c9641293
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=broken+age+mod+apk'. This URL is presented within the document body, suggesting a social engineering lure to trick users into downloading potentially malicious content. The presence of a large number of external PDF links, many hosted on shopify.com, further indicates a link farm or SEO poisoning tactic to distribute the malicious PDF. 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.cc/pify?keyword=broken+age+mod+apk
    • http://zudekun.clarkstownreformedchurch.org/uploads/1/3/1/1/131164250/a8b084a7dc.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/74841838216.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/kuzuwagixivutufivopodu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/scales_and_arpeggios_aristocats.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4651/files/lexigikodetetesumebixim.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/94763231649.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/panotawelomoredosusul.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/kinemufokipiwajibileju.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/pair_xbox_one_controller.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/mofat.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/nasiwaputunikusufeda.pdf
    • https://cdn.shopify.com/s/files/1/0433/7395/3187/files/bank_exam_study_material_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/34424554807.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/55626852114.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_off000062a4.bin
05579f9b8d62550133e525974006e4488eda1533a4a8d755fd482fbb9529987d
pdf-font-stream PDF embedded font (sfnt) at offset 0x62A4 5180 bytes
font_01_sfnt_off00007430.bin
355d8efa46792b6d7f9cff4074587d3ee8b8e856d773f98d2243bcf07555b88d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7430 10060 bytes