Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff9d1958490caf1…

MALICIOUS

PDF

39.4 KB Created: 2020-09-02 02:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde0f696f988f8dc4d950079019a3e12 SHA-1: 676aa9ea84b30b961a9fdcf24e0dfdc32693068c SHA-256: bff9d1958490caf1dcba750fc1d5006394c1c7b517ec3ee5f64ad93d144cfbcd
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are benign, but one critical link points to a known malicious redirector. The document body text and the malicious URL both reference 'photoshop cc 2017 amtlib.dll file', indicating a lure for pirated software. The ML classifier strongly supports the malicious verdict. The primary attack vector is likely a user clicking the malicious link to download further malicious 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.cc/wix?keyword=photoshop+cc+2017+amtlib.+dll+file
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/spanish_stories_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0445/4517/9807/files/app_store_iphone_7_plus.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2217/files/47811030762.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5831/files/tofadunajepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/movuguwebagidusoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2111/files/neonatal_jaundice_nursing_care_plan.pdf
    • https://static.usrfiles.com/ugd/934fc3_6b1340f202a84ad5aa638b6edc2f7663.pdf
    • https://static.usrfiles.com/ugd/52b593_ca58058af3cc46cf865bddf92736a79c.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/black_operations_2_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/9264/5790/files/cemento_portland_puzolanico.pdf
    • https://cdn.shopify.com/s/files/1/0465/9160/6949/files/free_radical_polymerization_mechanism.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7151/files/ubuntu_update_command.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_off000059a9.bin
3e893365a000e0561a9c3fbf5706c448efb23961a9fe807e911189bd05d00cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A9 5876 bytes
font_01_sfnt_off00006d97.bin
409edec17fc5c800a6259fafdb6253cd70a5d7a9b26dfaa6bc37d71b13f59860
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D97 10640 bytes