Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1215aed83e24b7d…

MALICIOUS

PDF

43.2 KB Created: 2020-08-15 05:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1aa5f596b0ee42a3bd3befa3ba66ac SHA-1: 495a1054a65bb2037fb2a790ecb5e791222a0c7b SHA-256: c1215aed83e24b7d1ebfe0b020a575ebb35dbd58c5ef19554a8a11c5d0d42e8a
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains hosting PDF files, likely as a SEO poisoning tactic. One critical heuristic identified a direct link to a known malicious redirector, https://ttraff.cc/pify?keyword=pulse+amplitude+modulation+output+waveform, which is the primary indicator of malicious intent. The ML classifier strongly supports the malicious verdict.

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=pulse+amplitude+modulation+output+waveform
    • http://files.loganfootball.com/uploads/1/3/2/6/132695361/degidewaxapix.pdf
    • http://files.iamauthorsonjarhodes.com/uploads/1/3/1/4/131409508/fapexerajarerovavo.pdf
    • http://rogofigug.preacherman.org/uploads/1/3/2/6/132696323/nutidakazototojotisu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/coursera_learning_how_to_learn.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/62309425609.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/ritanamifufidatorufavafij.pdf
    • https://cdn.shopify.com/s/files/1/0429/2712/8735/files/41096781883.pdf
    • https://cdn.shopify.com/s/files/1/0435/9317/1103/files/81914567660.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/vmware_free_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0434/7101/2006/files/stp_mathematics_3a_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/48178472438.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/ias_zoology_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/13254867436.pdf
    • https://cdn.shopify.com/s/files/1/0434/3329/6028/files/boc_study_guide_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2343/2861/files/remetotodina.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/fokekilenakitelajisijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/simubit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/server_icon_minecraft.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_off0000694f.bin
f57861cdec49028f1cc8af5b17dd157953bc4ba17a888999e04ba9059836f029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694F 5340 bytes
font_01_sfnt_off00007b74.bin
d5c5a13359bfe16d0353167861c5b4d5ff017a6281932faa0ceeb67c29cfa629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B74 10404 bytes

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